This is a question many UK readers search for, so our team has opened it to collect the community's knowledge. This topic is about the UK; rules differ from one country to another.
In the UK, CBD itself is not a controlled substance. However, CBD products must not contain controlled cannabinoids such as THC beyond the strict "exempt product" conditions set by the Misuse of Drugs Regulations. In practice, this means no more than 1 mg of THC per container.
For CBD foods, including oils and edibles, there is an extra requirement: the product must appear on the Food Standards Agency's public list of CBD products linked to a novel food application.
This is not legal advice. Please check official sources such as the Home Office and the Food Standards Agency, as rules can change.
If you buy CBD in the UK, do you check whether the product is on the FSA list before ordering? How easy did you find it to verify?