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Top Third Party Verification Companies in London

Ratings Updated: April 1, 2026

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2 Leaders 13 Contenders

15 Companies

Country: England

City: London

Outbound Services: Third party verification

List of the Top London Third-Party Verification Companies

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SalesAR

4.9 129 reviews

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Premier Verified

$1,000+

< $25 / hr

50 - 249

London, England

Services provided

10% Call Center Services

80% Sales Outsourcing

5% Content Marketing +1

5% Email Marketing

Focus Areas

30% Third party verification

70% Customer Surveys & Market Research Calls

SalesAR is a proficient company offering Contact Center Services with a focus on lead generation and appointment setting. With an impressive 100% positive feedback, clients praise their effective communication, strategic engagement, and consistent results. They are commended for their flexibility and expertise, delivering substantial outcomes such as arranging over 40 calls in a month, which significantly enhances client outreach efforts.

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3 of 6 reviews are 5 stars

Less than $10,000 avg. project cost

Reviewed 6 times in the past 6 months
In the last six months, reviews for SalesAR indicate a mixed sentiment. Clients from various sectors praised their structured project management and adaptability, particularly in lead generation and outreach strategies. Positive feedback highlighted effective communication and tailored campaigns, leading to meaningful engagements. However, one client reported a lack of success, receiving zero leads, citing poor targeting and irrelevant outreach. Overall, while many clients appreciated SalesAR's services, there were notable concerns regarding lead quality and alignment with client needs.
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3 of 4 Call Center Services reviews are 5 stars

Less than $10,000 avg. project cost

Call Center Services PROJECT HIGHLIGHT

Appointment Setting Services for Product Development Company
5.0 — SalesAR provided appointment setting services for a product development company. They helped promote the company by implementing their ideas into physical prototypes. Read more
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More responsive than most other service providers

SalesAR is very responsive
They are a great candidate to start a conversation with. Send them a short message or project inquiry.
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Review Rating from Clients

5.0/5.0

Quality

5.0

Schedule

5.0

Cost

5.0

Willing to Refer

5.0

Reviews from Cambridge emphasize SalesAR's proficiency in targeted lead generation and outreach, successfully engaging prospects in automotive, manufacturing, and IoT sectors. Clients value their reliable, timely delivery and dedicated team effort in complex sales funnel development.
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Task Virtual

4.9 54 reviews

$1,000+

< $25 / hr

50 - 249

London, England

Services provided

10% Call Center Services

20% Back Office Outsourcing

20% Search Engine Optimization +5

10% Content Marketing

10% Graphic Design

10% Social Media Marketing

10% Web Design

10% Web Development

Focus Areas

10% Third party verification

50% Customer Surveys & Market Research Calls

40% B2C Telemarketing & telesales

Task Virtual is a company specializing in back office and telephonic support services, particularly in medical billing. Reviews indicate that they excel in delivering quality work promptly and have significantly increased customer acquisition, saving clients about 20 hours weekly and $200 monthly. Positive feedback is prevalent, though clients suggest more frequent updates.

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Reviews mention Flexible
Clients have expressed a strong sentiment regarding Task Virtual's flexibility. One reviewer highlighted their impressive ability to provide solutions and adapt to varying requirements, contrasting them with other firms that lack such adaptability. Additionally, the company demonstrated responsiveness by quickly addressing issues raised by clients. Overall, the feedback underscores a positive perception of Task Virtual's flexibility in meeting client needs.

BPO Services for Creative Design Agency

5.0 May 17, 2022

We're impressed with their ability to provide solutions to every problem. I have worked with many companies some of them do not adjust and try not to be flexible with any requirement that comes in. Obviously every company needs improvement nobody is perfect. We did face some issues, which we conveyed to them and they sorted out very quickly.
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1 of 1 reviews is 5 stars

Less than $10,000 avg. project cost

Reviewed 1 time in the past 6 months
In the past six months, Task Virtual has received positive feedback for their effective SEO strategies, which significantly increased organic traffic and improved keyword rankings for clients like PESTUK. Clients praised their excellent project management, timely delivery, and responsiveness to needs. Notably, their tailored approach and transparency in communication stood out, fostering confidence in their methods. While minor suggestions for improved clarity in initial phases were noted, overall sentiment reflects high satisfaction with the results achieved.
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0 of 1 Call Center Services reviews are 5 stars

Less than $10,000 avg. project cost

Call Center Services PROJECT HIGHLIGHT

Call Center Services for Event Staffing Company
5.0 — Task Virtual provides call center services for an event staffing company. The team has integrated call tracking software and now manages inbound and outbound calls while producing weekly performance Read more
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Average Project Cost Breakdown

Less than $10,000 (9) $10,000 to $49,000 (3) $50,000 to $199,999 (1)

What Clients Have Said
Overall, clients express a strong sentiment regarding Task Virtual's cost-effectiveness and value for money. Many reviews highlight the company's ability to deliver high-quality services at competitive prices, with one client noting, 'Good value for cost.' Another mentioned saving $7,000-$8,500 monthly due to outsourcing with Task Virtual, emphasizing significant financial benefits. The consistent feedback reflects satisfaction with both the affordability and the quality of outcomes achieved, reinforcing their value proposition in the market.
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Abacus Outsourcing

Not yet reviewed

$250,000+

< $25 / hr

1,000 - 9,999

London, England

Services provided

35% Call Center Services

15% Business Consulting

15% Sales Outsourcing +6

10% Financial Consulting

5% Custom Software Development

5% Enterprise App Modernization

5% HR Outsourcing

5% IT Staff Augmentation

5% Other IT Consulting and SI

Focus Areas

20% Third party verification

35% B2C Telemarketing & telesales

30% Collections Recovery Services +1

15% Customer Surveys & Market Research Calls

Abacus Outsourcing is a call center company. Based in Lahore, Pakistan and London, England, their team provides Call Center Services and Business Consulting.
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More responsive than most other service providers

Abacus Outsourcing is very responsive
They are a great candidate to start a conversation with. Send them a short message or project inquiry.
Get in Touch

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London, England

2 Kingdom Street
London, England W2 6BD
2 - 5

+44 (0) 203 580 4343

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Microtalk

Not yet reviewed

Undisclosed

Undisclosed

50 - 249

London, England

Services provided

100% Call Center Services

Focus Areas

25% Third party verification

25% B2C Telemarketing & telesales

25% Collections Recovery Services +1

25% Customer Surveys & Market Research Calls

Microtalk is a call center service. Their team is in London, England and Kolkata, India and provides Call Center Services.
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Zebra Connexions Ltd

Not yet reviewed

$1,000+

$25 - $49 / hr

10 - 49

Harlow, England

Services provided

80% Call Center Services

20% Back Office Outsourcing

Focus Areas

25% Third party verification

25% B2C Telemarketing & telesales

25% Collections Recovery Services +1

25% Customer Surveys & Market Research Calls

Established in 2004, Zebra Connexions Ltd is an answering service. The small team specializes in Call Center Services and Back Office Outsourcing.
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Medlysis

5.0 1 review

$1,000+

< $25 / hr

10 - 49

London, England

Services provided

55% Call Center Services

25% Recruitment Process Outsourcing

20% Customer Service Outsourcing

Focus Areas

30% Third party verification

30% Collections Recovery Services

25% B2C Telemarketing & telesales +1

15% Customer Surveys & Market Research Calls

Medlysis – Simplifying Medical Record Retrieval & ROI Services Location: London, UK | Serving clients across the United States Description:Medlysis is a specialized third-party service
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Emerj.io

Not yet reviewed

$1,000+

< $25 / hr

250 - 999

London, England

Services provided

13% Call Center Services

7% Tax Law

5% Back Office Outsourcing +61

3% Direct Marketing

2% Accounting

2% Corporate Law

2% HR Consulting

2% HR Outsourcing

2% IT Staff Augmentation

2% Insurance Services & Brokers

2% Mobile App Development

2% PEO/Employee Leasing

2% Recruiting

2% Recruitment Process Outsourcing

2% Talent Representation

2% Web Development

1% AR/VR Development

1% Advertising

1% Affiliate Marketing

1% Banking Law

1% Branding

1% Business Consulting

1% Commercial Financing

1% Content Marketing

1% Content Moderation Services

1% Content Writing Services

1% Corporate Relocation

1% Corporate Training & Coaching

1% Data Annotation Services

1% Digital Asset Management

1% Digital Engineering

1% Document Digitization & Management

1% Email Marketing

1% Enterprise App Modernization

1% Executive Search

1% Fabrication

1% Family Law

1% Finance & Accounting Outsourcing (FAO)

1% Finance Law

1% Financial Advising & Planning

1% Fractional CFO Services

1% Funding & Investment

1% Immigration Law

1% Insurance Law

1% Intellectual Property Law

1% Internet & Technology Law

1% Labor & Employment Law

1% Language Interpretation

1% Litigation Support Services

1% Malpractice Law

1% Manufacturing Consulting

1% Media & Entertainment Law

1% Pay Per Click

1% Procurement Support

1% Product Marketing

1% Public Relations

1% Robotics Process Automation

1% SMS Marketing

1% Sales Outsourcing

1% Sports Marketing

1% Staffing

1% Transcription

1% Translation

1% Video Marketing

Focus Areas

50% Third party verification

20% B2C Telemarketing & telesales

20% Collections Recovery Services +1

10% Customer Surveys & Market Research Calls

Emerj.io, an answering service company, is based in London, England. The team offers Call Center Services and Tax Law.
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VeriCall Ltd

Not yet reviewed

Undisclosed

Undisclosed

250 - 999

London, England

Services provided

50% Call Center Services

50% Back Office Outsourcing

Focus Areas

50% Third party verification

50% Collections Recovery Services

VeriCall Ltd, a call center service and Back Office Outsourcing company, was established in 2017. The company specializes in Call Center Services and Back Office Outsourcing, and is midsize.
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Smart Call Solutions Pvt Ltd

Not yet reviewed

Undisclosed

Undisclosed

50 - 249

London, England

Services provided

40% Call Center Services

20% Customer Service Outsourcing

20% Digital Strategy +1

20% Search Engine Optimization

Focus Areas

10% Third party verification

40% B2C Telemarketing & telesales

35% Customer Surveys & Market Research Calls +1

15% Collections Recovery Services

Call center company Smart Call Solutions Pvt Ltd was founded in 2022. The team offers Call Center Services and Digital Strategy.
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London, England

Middlesex Street, London
London, England E17HT
41 - 49

+442080500285

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Recruit Overseas

Not yet reviewed

Undisclosed

Undisclosed

50 - 249

London, England

Services provided

14% Call Center Services

16% Recruiting

14% Customer Service Outsourcing +4

14% HR Outsourcing

14% Recruitment Process Outsourcing

14% Sales Outsourcing

14% Staffing

Focus Areas

25% Third party verification

25% B2C Telemarketing & telesales

25% Collections Recovery Services +1

25% Customer Surveys & Market Research Calls

Recruit Overseas is a Recruiting company. Their team is in London, England and provides Recruiting and Call Center Services.
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Web3 Community Management

Not yet reviewed

$50,000+

$200 - $300 / hr

10 - 49

London, England

Services provided

10% Call Center Services

20% Customer Service Outsourcing

20% Sales Outsourcing +8

15% Back Office Outsourcing

5% Corporate Training & Coaching

5% Document Digitization & Management

5% IT Managed Services

5% IT Staff Augmentation

5% Marketing Strategy

5% Other IT Consulting and SI

5% Social Media Marketing

Focus Areas

25% Third party verification

25% B2C Telemarketing & telesales

25% Collections Recovery Services +1

25% Customer Surveys & Market Research Calls

Customer Service Outsourcing company Web3 Community Management is in San Francisco, California and London, England. They provide Customer Service Outsourcing and Sales Outsourcing.
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London, England

18 Finsbury Square
London, England EC2A 1DX
6 - 9

9168739000

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Circa Core Ltd

Not yet reviewed

Undisclosed

$25 - $49 / hr

2 - 9

London, England

Services provided

40% Call Center Services

25% CRM Consulting and SI

15% Business Consulting +2

10% AI Agents

10% Back Office Outsourcing

Focus Areas

50% Third party verification

30% Customer Surveys & Market Research Calls

20% B2C Telemarketing & telesales

Circa Core Ltd is a small answering service company. Founded in 2025, the team focuses on Call Center Services and CRM consulting and SI.
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Whistl

Not yet reviewed

Undisclosed

Undisclosed

1,000 - 9,999

Marlow, England

Services provided

15% Call Center Services

30% Fulfillment

10% Back Office Outsourcing +8

10% Customer Service Outsourcing

10% Logistics & Supply Chain Consulting

5% Air Freight

5% Freight forwarding

5% Ocean Freight

5% Rail Freight

3% Direct Marketing

2% Product Marketing

Focus Areas

15% Third party verification

70% Customer Surveys & Market Research Calls

15% B2C Telemarketing & telesales

Whistl , a Fulfillment company, was founded in 1950. The team focuses on Fulfillment and Call Center Services and is based in Marlow, England.
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Daktela UK

Not yet reviewed

Undisclosed

Undisclosed

10 - 49

Winnersh, England

Services provided

100% Call Center Services

Focus Areas

25% Third party verification

25% B2C Telemarketing & telesales

25% Collections Recovery Services +1

25% Customer Surveys & Market Research Calls

Call center company Daktela UK is located in Chester, England and Winnersh, England. Founded in 2005, the team specializes in Call Center Services.
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Winnersh, England

Winnersh Triangle Building 220 Wharfedale Rd
Winnersh, England RG41 5TP
10 - 15

+ 44 (0)800 470 2159

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CATI call center

Not yet reviewed

$1,000+

< $25 / hr

50 - 249

Monks Risborough, England

Services provided

50% Call Center Services

10% Customer Service Outsourcing

10% Direct Marketing +3

10% Event Marketing

10% Market Research

10% Public Relations

Focus Areas

10% Third party verification

40% Collections Recovery Services

40% Customer Surveys & Market Research Calls +1

10% B2C Telemarketing & telesales

CATI call center is an answering service company. Launched in 2011, the team offers Call Center Services and Event Marketing. The company is in Kyiv, Ukraine and Monks Risborough, England.
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Monks Risborough, England

71 South Street
Monks Risborough, England HP27
10 - 15

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Ability to deliver

Focus

Proven

Market Leaders

Emerging

Niche

Clutch Leaders Matrix

Rollover to see company insights or click a company below for more details.

1 SalesAR

2 Task Virtual

A Clutch Leaders Matrix provides a broad view of the top-performing companies in a particular service or location. Each company featured in a Leaders Matrix is evaluated based on Focus and Ability to Deliver. The size of each circle indicates that company’s size.

By using verified reviews, focused service details, and real project data, the Leaders Matrix highlights companies that consistently deliver and stand out from the rest. Each company’s position is based on how well they focus on a service area and how consistently they deliver results, helping you make informed, confident decisions. Learn More

Focus (x-axis)

Focus accounts for a company’s specialization within a certain service.

Ability to Deliver (y-axis)

Ability to Deliver considers three criteria:

Client feedback and reviews
Work experience and previous projects
Market presence and reputation in the industry

List of the Top 2 London Third-Party Verification Companies

SalesAR

$1,000+

< $25 / hr

50 - 249

London, England

Ability to deliver

37.9/40.0

20/20 Reviews

10/10 Clients & Experience

7.9/10 Market Presence

Service focus

10% Call Center Services

30% Third party verification

90% Other

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Task Virtual

$1,000+

< $25 / hr

50 - 249

London, England

Ability to deliver

27.2/40.0

16.6/20 Reviews

2.2/10 Clients & Experience

8.3/10 Market Presence

Service focus

10% Call Center Services

10% Third party verification

90% Other

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Abacus Outsourcing

$250,000+

< $25 / hr

1,000 - 9,999

London, England

Ability to deliver

7.6/40.0

0/20 Reviews

0/10 Clients & Experience

7.6/10 Market Presence

Service focus

35% Call Center Services

20% Third party verification

65% Other

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Microtalk

Undisclosed

Undisclosed

50 - 249

London, England

Ability to deliver

5.2/40.0

0/20 Reviews

0/10 Clients & Experience

5.2/10 Market Presence

Service focus

100% Call Center Services

25% Third party verification

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Zebra Connexions Ltd

$1,000+

$25 - $49 / hr

10 - 49

Harlow, England

Ability to deliver

5.6/40.0

0/20 Reviews

0.7/10 Clients & Experience

4.9/10 Market Presence

Service focus

80% Call Center Services

25% Third party verification

20% Other

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Medlysis

$1,000+

< $25 / hr

10 - 49

London, England

Ability to deliver

5/40.0

0/20 Reviews

1/10 Clients & Experience

4/10 Market Presence

Service focus

55% Call Center Services

30% Third party verification

45% Other

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Emerj.io

$1,000+

< $25 / hr

250 - 999

London, England

Ability to deliver

4.9/40.0

0/20 Reviews

0/10 Clients & Experience

4.9/10 Market Presence

Service focus

13% Call Center Services

50% Third party verification

87% Other

View Profile Visit Website
VeriCall Ltd

Undisclosed

Undisclosed

250 - 999

London, England

Ability to deliver

0/40.0

0/20 Reviews

0/10 Clients & Experience

0/10 Market Presence

Service focus

50% Call Center Services

50% Third party verification

50% Other

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Smart Call Solutions Pvt Ltd

Undisclosed

Undisclosed

50 - 249

London, England

Ability to deliver

4.1/40.0

0/20 Reviews

0.1/10 Clients & Experience

4/10 Market Presence

Service focus

40% Call Center Services

10% Third party verification

60% Other

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Recruit Overseas

Undisclosed

Undisclosed

50 - 249

London, England

Ability to deliver

4/40.0

0/20 Reviews

0/10 Clients & Experience

4/10 Market Presence

Service focus

14% Call Center Services

25% Third party verification

86% Other

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Web3 Community Management

$50,000+

$200 - $300 / hr

10 - 49

London, England

Ability to deliver

4.4/40.0

0/20 Reviews

0/10 Clients & Experience

4.4/10 Market Presence

Service focus

10% Call Center Services

25% Third party verification

90% Other

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Circa Core Ltd

Undisclosed

$25 - $49 / hr

2 - 9

London, England

Ability to deliver

4/40.0

0/20 Reviews

0/10 Clients & Experience

4/10 Market Presence

Service focus

40% Call Center Services

50% Third party verification

60% Other

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Whistl

Undisclosed

Undisclosed

1,000 - 9,999

Marlow, England

Ability to deliver

6.4/40.0

0/20 Reviews

0/10 Clients & Experience

6.4/10 Market Presence

Service focus

15% Call Center Services

15% Third party verification

85% Other

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Daktela UK

Undisclosed

Undisclosed

10 - 49

Winnersh, England

Ability to deliver

10/40.0

0/20 Reviews

4.5/10 Clients & Experience

5.6/10 Market Presence

Service focus

100% Call Center Services

25% Third party verification

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CATI call center

$1,000+

< $25 / hr

50 - 249

Monks Risborough, England

Ability to deliver

5.2/40.0

0/20 Reviews

0/10 Clients & Experience

5.2/10 Market Presence

Service focus

50% Call Center Services

10% Third party verification

50% Other

View Profile Visit Website

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Specialties

Third Party Verification Sales Outsourcing Telemarketing Lead Generation Inbound Appointment Setting Appointment Setting Virtual Receptionist Order Processing Outbound

Get personalized agency matches based on your project goals.

Top Third Party Verification Companies in London

List of the Top London Third-Party Verification Companies

Reviewed 6 times in the past 6 months

Appointment Setting Services for Product Development Company

SalesAR is very responsive

Reviews mention Flexible

BPO Services for Creative Design Agency

Reviewed 1 time in the past 6 months

Call Center Services for Event Staffing Company

Average Project Cost Breakdown

What Clients Have Said

Abacus Outsourcing is very responsive