BEDROOM LOCKS

I can't imagine a conventional lock on the outside that wouldn't require some drilling and screws. If the door has an existing handle system, you may be able to remove that and insert a barrel that has a lock.

However, if you Google something like "a lock that doesn't require drilling or screws", you'll see door jammers and handle stoppers and the like.

Lock on a bedroom door!

Do you mean like :

This is the simplest type of lock that exists - and it STILL NEEDS screwing to the door and frame…..

mind you - it's not exactly secure - the screws are accessible and easy to remove

r.e. a lock on the outside, I don't see how the law could differentiate between it being for the purpose of keeping someone in; and for the purpose of simply keeping the room secure when it's empty (the latter of which is absolutely legal)

When my grandmother bought her bungalow we discovered the main bedroom door was reinforced and has a very substantial lock on it … as the previous occupier was not a stereotypical bungalow owner but a large and rather aggressive young bloke we were a bit worried as to what we'd bought … what had he been doing in there?

Luckily we found some mounts elsewhere which were for a gun safe, so realised it was most likely just to comply with the legislation on locking the ammunition separately from the weapon, but we did panic a little bit!!