Why this matters.
If your website lets visitors post comments, reviews, photos or forum messages, you can become legally responsible for what appears on it. The Online Safety Act 2023 applies to user-to-user services with links to the UK, requiring illegal content risk assessments, reporting and complaints routes, and proactive steps to remove illegal material. Ofcom can fine up to £18 million or 10% of qualifying worldwide revenue, so small sites are not exempt just because they are small.
Separately, the Defamation Act 2013 offers website operators a defence for posts by others only if they follow the section 5 process when a complaint is made, and regulation 19 of the Electronic Commerce (EC Directive) Regulations 2002 requires prompt removal of unlawful material once you know about it. Clear terms of use, a simple reporting button and a documented takedown routine are the practical steps that keep your protection in place.