Companies and individuals not authorised and regulated by the Financial Conduct Authority (FCA) must ensure that any financial promotions they communicate comply with the requirements of the financial promotion restriction in section 21 of the Financial Services and Markets Act 2000 (FSMA). This note provides an introduction to UK financial promotion regime for such unauthorised persons, explaining the nature of the restriction, how it impacts on them and their business, what they need to do to ensure they do not breach the restriction, and the penalties if they do.