Founder and operator of firmdat.co.uk. Writes the articles on this website about company data, public registers and the rules for contacting businesses in the United Kingdom.
Who is behind firmdat.co.uk
firmdat.co.uk is run by Martin Adamec as a sole trader. Behind the content, the choice of data sources and the replies to requests is a specific person, not an agency. The full provider details are in the legal notice.
Legal form
Sole trader
In business since
24 July 2023
Prices
Prices shown are the full price – nothing is added.
The articles on firmdat.co.uk revolve around one question: how do you work with data about businesses in the United Kingdom in a way that is both lawful and practical? They describe where company data come from, what Companies House makes public, how UK SIC codes define a target group, when PECR allows marketing emails to businesses without consent and why phone numbers must be screened against TPS and CTPS.
The principle: give figures with a date and source, label approximations as approximations, say openly what is not known, and do not round in our own favour. How we work is described on the data sources and methodology page, the current status on the database status page.
Articles
Buying UK business data: what to check4 November 2026 – Nine checks before you order a UK business list: source, date of the data, contact fields, sample file, legal form for PECR, TPS screening and the price per usable record.
PECR and B2B marketing: email, texts and calls to UK businesses4 November 2026 – Email, text, live and automated calls, post: what PECR requires when you contact limited companies, sole traders and partnerships, with the regulations on legislation.gov.uk.
UK SIC 2007: industry codes for target group lists4 November 2026 – How UK SIC 2007 is structured, how the five-digit subclasses differ from NACE, how companies choose their codes and how to use them to define a target group.
