UK Companies Act Email Signature Requirements

The Companies Act 2006 extends the disclosure rules that apply to business letters and order forms to electronic communications, so UK-registered companies are required to include specific identifying details on outgoing business email. The required items are the company's full registered name, its registered number, the part of the UK in which it is registered, and the address of its registered office. Additional requirements apply to particular company types, including limited liability partnerships and companies that are being wound up. There are two details firms commonly get wrong. The registered name is not the trading name, and where they differ both are usually needed. And the requirement applies to business email generally, not only to formal correspondence, which means it belongs in the standard signature block rather than being added case by case. For UK firms this is one of the strongest practical arguments for centrally managed signatures, because the requirement is per-company rather than per-person and a single missing block on one employee's email is a company-level compliance gap rather than an individual one.