Lead generator, the three different things sold under that word and the UK consent rules that decide which you can use

Three completely different products are sold as a lead generator. The first is a page or a form on your own site that turns a visitor into an enquiry. The second is a software tool that finds contact details for companies or people who match a profile. The third is a company that sells you enquiries it has collected somewhere else, usually priced per lead and often sold to your competitors at the same time. They cost different amounts, they fail in different ways, and in the United Kingdom the rules about who you may then contact differ sharply between them. Working out which one you are buying is the first decision, not a detail.

Google reports 210 searches a month in the United Kingdom alone for "lead generator website", with 170 for "sales lead generator", 110 for "online lead generator" and 70 for "construction lead generator", harvested on 22 October 2026 against the United Kingdom target on its own.

The three kinds, side by side

What it is	What you pay for	How it fails
A lead generator on your own site, meaning a landing page, a form, a quote tool or a calculator	Build and traffic. You own the asset and every enquiry it produces	Nobody arrives, because the page was built before the demand was checked
A finder tool, meaning software that returns company and contact records matching filters	A subscription, usually by credits or rows exported	The records are stale, or they are people you are not permitted to email in Britain
A lead seller, meaning a company that collects enquiries and sells them on	Per lead, or per exclusive lead at a premium	The same enquiry reaches four firms, so the sale goes to whoever rings first rather than whoever is best

The first kind is the only one that compounds. A quote page that works keeps working, and the enquiry belongs to you. The second two are rented, and the price per enquiry rises as more buyers join. That is not a reason to avoid them, because a new trade business with no site traffic has to start somewhere, but it is the reason to treat them as a bridge rather than a plan.

The British part, which is where most of this goes wrong

A list of contacts is not a permission to contact them, and in the United Kingdom the relevant distinction is not business against consumer. It is corporate body against individual. The Information Commissioner's Office states it directly in its guidance on electronic mail marketing, read at ico.org.uk on 22 October 2026:

"Sole traders and some partnerships are treated as individuals, so you can only email or text them if they have specifically consented, or if they bought a similar product from you in the past and didn't opt out from marketing messages when you gave them that chance."

And on the other side of the line, from the same page: "You can email or text any corporate body (a company, Scottish partnership, limited liability partnership or government body). However, it is good practice, and good business sense, to keep a 'do not email or text' list of any businesses that object or opt out, and screen any new marketing lists against that."

That one distinction reshapes what a British B2B finder tool is worth to you. A list of two thousand UK plumbers is mostly sole traders and small partnerships, which the ICO treats as individuals, so cold email to it is not available on the same basis as cold email to limited companies. A list of two thousand facilities managers at limited companies is a different proposition entirely. The same guidance also records that there is no email preference service equivalent to the telephone registers, because the consent rule is meant to make a central opt out register unnecessary. This is guidance on marketing rules rather than legal advice, and anything with real money behind it is worth putting to a solicitor.

The consent record is the artefact that decides whether a lead is usable, and how to build and keep one is covered in the consent record that decides which contacts you can actually use.

Judging a lead seller before you sign

Five questions, and the answers tell you more than any testimonial on the page.

• How many firms get this lead. Ask for the number, not the policy. If the answer is a range, price it at the top of the range.
• How was the enquiry collected. A person filling in a quote form on a site about the actual job is a different thing from a person who entered a prize draw. Ask to see the page the lead came from.
• What is the replacement policy for a bad lead. Specifically for a wrong number, a duplicate, and somebody who says they never enquired. All three happen and a vendor who will not write the policy down has one.
• What is the minimum commitment. Per lead pricing with a monthly minimum is a retainer wearing a different name.
• Can you test fifty before you commit to a thousand. The refusal is the answer.

Then do the arithmetic before the first invoice. Take your own conversion rate from enquiry to sale, your average job value and your gross margin. A lead at GBP 40 with a one in eight conversion costs GBP 320 of lead spend per won job, and whether that is good or terrible depends entirely on the margin on the job, not on the price of the lead. Run that sum first and the question of whether a given vendor is expensive answers itself.

Building the kind you own

A lead generator on your own site is four parts and the order matters.

• One job per page. A page for boiler replacement and a page for annual servicing outperform one page about heating, because the person searching is already specific.
• A form that asks the minimum. Every field is a reason to leave. Ask for what you need to quote and get the rest on the phone.
• The answers a British buyer wants before they enquire. Coverage area in place names people actually use, a price basis even if it is a range, how soon you can attend, and the registration or accreditation number somebody can check.
• A response time you keep. Speed of reply beats almost every other variable in trade and professional services, and it is the one part of this that costs nothing to fix.

Reviews, because this is where lead generation meets the advertising rules

Lead sellers and quote sites run on reviews, and the British rules on them changed. New rules were added to the CAP Code to reflect the unfair commercial practices provisions in the Digital Markets, Competition and Consumers Act 2024, and the ASA's own advice page on fake consumer reviews, read at asa.org.uk on 22 October 2026, records that the relevant provision "came into force on 6 April 2025". It quotes the new rules, including 3.44, "Marketing communications must not contain fake consumer reviews", and 3.45, "Marketing communications must make clear where consumer reviews have been incentivised." The same page lists publishing reviews in a misleading way as covering "failing to publish, or removing from publication, negative consumer reviews whilst publishing positive ones".

That matters on both sides of a lead deal. It sets what you may do with the reviews on your own quote page, and it is a fair question to ask a platform that is selling you leads partly on the strength of its own star ratings.

Questions about lead generators

What is a lead generator

One of three things. A page or form on your own site that converts a visitor into an enquiry, a software tool that finds matching company or contact records, or a company that sells you enquiries it collected elsewhere. Decide which one you are buying before you compare prices, because the three are not substitutes.

Can I cold email a list of UK businesses

It depends on what the business is. The ICO's guidance states you can email any corporate body, meaning a company, a Scottish partnership, a limited liability partnership or a government body, while sole traders and some partnerships are treated as individuals and need specific consent or a prior purchase with an opt out offered. So the legal entity on the record, not the fact that it is a business, is what decides it.

Are bought leads worth it

They are worth exactly what your own arithmetic says. Multiply your cost per lead by the number of leads it takes you to win one job, and compare that with the gross margin on the job. Run it on fifty leads before you commit to a thousand, and insist on knowing how many other firms get the same enquiry.

What is the difference between a lead and an enquiry

In practice, who asked. An enquiry is somebody contacting you about a specific job. A lead can be a record of somebody who matched a profile and has never heard of you. The two convert at completely different rates, so a cost per lead and a cost per enquiry are not comparable figures.

How many leads should a quote page produce

Judge the page on the share of visitors who enquire rather than on the count, because the count is a traffic question. Measure your own baseline first, change one thing at a time, and keep the form field count as low as the quote allows.

Do I need consent to call a UK business

Live marketing calls are governed by their own rules and the corporate telephone preference register, which is a separate screening obligation from the email position above. Check the current ICO guidance for telephone marketing before you build a calling list, and keep your own do not contact list regardless.

The enquiry that never reaches your form

Every route on this page assumes a buyer who searches, clicks and lands somewhere. A growing number now ask an assistant instead. They describe the job, get two or three companies named in a sentence each, and ring one of them. There is no form, no lead fee and no row in any report, and for a British trade or professional firm the difference between being one of the named three and not being mentioned is the difference between a steady trickle of enquiries and silence. It is a measurable thing rather than a mood, and worth measuring for your own category with your own name kept out of the question. AI Knows Us puts those buying questions to the main assistants and records which companies get named and the sources behind each answer.