A uk mailing list one time csv is the United Kingdom pack sold as a file you keep. The page is the UK email database: 3 million records covering B2B and B2C, US $100, CSV and Excel. Read that page for how the two audiences sit in the file before you write one subject line for all of them.
UK rules are not the US footer
PECR and UK GDPR apply to mail into the UK even if you send from abroad. A purchased list is not consent. Identify the sender, offer a real opt-out, and do not hide the commercial nature of the message. If you cannot run that, do not buy the million-scale file. Buy the sample and stop.
Where it sits among the other large files
The United States company sheet is the usa company email database one time csv, 10 million at US $100. Germany companies are the german company mailing list one time csv. Spain companies are the spain company mailing list one time csv. Each is a one-time download at US $100. Three or four of those is still cheaper than the worldwide mailing lists one time csv at US $1499. Cross that line only when more countries are genuinely in the plan.
Open the sample as a sheet
The sample tells you whether a row is a company domain or a personal inbox. If you only wanted firms, do not mail the personal half. If you only wanted homes, do not mail the company half. One UK email database can hold both. One campaign should not.