You’re not going to have a problem carrying a larger knife or fixed blade if you’re out hunting or camping or similar, it’s in the city doing basic EDC that’s the issue.
I found this UK lawyer discussing a case of wearing multitool in public interesting:
Basically everyday carry in case some tool might be needed was not deemed by a court as good enough to reason to carry a multitool. Instead you should have a specific task in mind to justify carrying. (And presumably for the offending blade - not sure a task involving the file would justify wearing a multitool with knife).
He has some other relevant videos too. Although they are UK specific some of the legal logic behind might be similar elsewhere. In one he says police might try to ask leading questions as "You think this might be used as a weapon?" - a question one should sidestep.