Quote Originally Posted by Greenbear View Post
A less than 3.5" folding, non-locking knife is UK legal to carry and will not arouse interest from the Police if carried sensibly (which means not to the shops/town centre/pubs and bars etc). Think your average Swiss Army Knife to get a picture of what is OK
3" cutting edge - and it has to take into account the actual cutting length with curves etc. Spot on with the advice about carrying it sensibly. Even though you are legally entitled to using the excuse "just because" is unlikely to lead to a pleasant encounter with an urban police officer in my experience.

https://www.gov.uk/buying-carrying-knives