B2B Data for Telemarketing Agencies: How to Source the Right Contacts and Maximise ROI

If you’re running outbound campaigns, sourcing accurate B2B data for telemarketing agencies isn’t just helpful — it’s essential.

Whether you’re cold calling for a client or running in-house lead gen, the quality of your contact data directly affects results. Dead numbers waste time. Poor targeting frustrates your team. And if your lists aren’t CTPS-cleaned, you’re risking fines as well as reputation.

At Results Driven Marketing, we work with dozens of UK-based telemarketing agencies — and we’ve seen what happens when the data’s wrong.

This guide is designed to help you avoid that.

You’ll learn:

• Why data quality impacts every part of your campaign

• What to look for in a supplier (especially around CTPS and targeting)

• How we support busy agencies who need fast, reliable data — and support to match

Why B2B Data Quality Makes or Breaks a Call Campaign

Let’s be blunt — even the most skilled telemarketer can’t convert a bad list.

Every time your team hits a dead number, speaks to a receptionist instead of a decision-maker, or dials a number flagged on the CTPS, you’re losing time, credibility, and in some cases, money.

And when you’re working under pressure to hit daily call volumes or deliver leads for multiple clients, that margin for error disappears fast.

Here’s what poor-quality data really costs a telemarketing agency:

• Wasted dials – low contact rates tank productivity

• Frustrated staff – morale dips when they feel like the data is working against them

• Compliance risks – CTPS violations are a serious threat, not just a checkbox

• Client retention issues – bad data means poor results, and poor results lead to tough conversations

By contrast, accurate, targeted, CTPS-cleaned data:

• Increases contact rates

• Connects your callers with the right people

• Helps you hit KPIs faster

• Reduces complaints

• Gives clients confidence in your process

In short, data quality isn’t a nice-to-have. It’s the difference between success and stress.

What Telemarketing Agencies Should Look for in a B2B Data Supplier

Full Contact Records with Job Titles

Calling the wrong person is as bad as calling no one.

Make sure your data includes:

• Contact name

• Job title

• Direct dial or main number

• Company name and address

• Industry and staff size (for segmentation)

You want decision-makers, not gatekeepers.

CTPS-Checked Phone Numbers

This is non-negotiable.

If you’re calling UK businesses, your numbers must be screened against the Corporate Telephone Preference Service (CTPS) — or you could face serious penalties.

The legal responsibility lies with the caller, not the data supplier. So if the list hasn’t been checked properly, you’re the one at risk.

Want to learn more about CTPS? Visit the ICO’s official guidance at https://ico.org.uk/

At Results Driven Marketing, every number is screened every 24 hours, and we provide documentation to prove it.

Filters by Sector, Size, and Role

For agencies running multiple campaigns, one-size-fits-all data just won’t cut it.

You should be able to specify:

• Industry sectors

• Company size (by staff count or turnover)

• Seniority (e.g. owners, directors, marketing managers)

• Geographic location

The more precise the targeting, the more effective the campaign.

Fast Turnaround and Responsive Support

You’re running on deadlines. Your supplier should be too.

Look for a provider who:

• Delivers counts quickly (same-day ideally)

• Offers fast dispatch (within 24 hours)

• Responds to changes or re-briefs without delay

• Gives you an actual contact, not just a generic help desk

That kind of support is rare — but it’s something we pride ourselves on at RDM.

How We Support Telemarketing Agencies at RDM

We work with telemarketing agencies across the UK on a regular basis — from solo consultants to multi-seat teams managing multiple clients at once. And we know exactly what you need to keep things moving.

Same-Day Data Counts

Need a quick list for a campaign going out tomorrow?
We can usually turn around your count and quote within hours — not days.

Just tell us:

• Who you want to target

• Sector, size, job title, region

And we’ll come back with the numbers, fast.

Data That’s Ready to Use

Every list includes:

• Business name, address, phone number

• Contact name and job title (where available)

• CTPS-cleaned phone numbers

• Filters applied exactly to your brief

You get it in Excel or CSV — clean, simple, and ready to drop into your dialler.

Flexible Licensing

All data comes with a 12-month multi-use licence, so you’re not paying again every time you call.

Want to use it for multiple campaigns or share with your client? That’s fine — just let us know your use case upfront.

Ongoing Accuracy Support

We offer industry-leading benchmarks:

• 98% postal accuracy

• 95% phone number accuracy

If we fall short, we’ll replace like-for-like — no fuss.

Real People, Real Support

You won’t deal with a ticket system. You’ll have someone who picks up the phone and knows your brief.

Most agencies work with us long-term because we treat them like partners, not transactions.

Final Thoughts: The Right Data Partner Lets You Focus on What You Do Best

Telemarketing agencies thrive on momentum. The last thing you need is a data supplier slowing you down with vague counts, delayed files, or lists that fall apart on the first few calls.

With the right partner, you can:

• Hit KPIs more easily

• Deliver better results for clients

• Keep your team focused on high-value conversations

• Work confidently knowing your data is clean and compliant

At Results Driven Marketing, we know the pressures agencies face — and we’re built to support you. Whether you need 1,000 contacts for a niche sector or 50,000 records across multiple campaigns, we’ve got you covered.

✅Same-day counts
✅Fast turnaround
✅CTPS-cleaned phone data
✅Clear licensing
✅Reliable support from real people

Ready to get started?

Click here to request a data count: https://rdmarketing.co.uk/buy-data/
Or contact us directly for advice on your next campaign: https://rdmarketing.co.uk/contact-us/