I just received word from my flatmate about a possible break-in. The building is secured by an outermost door, behind which lie doors to our flat and one other. These doors are also kept locked, but today my flatmate returned home to find our flat's door open without sign of forced entry.
We have only started to move in very recently and are still moving things between properties. The property in question is managed by an estate agent.
Do we have any legal grounding for demanding that the locks be replaced and room keys provided? (We were not supplied with individual room keys despite the doors coming with locks).
EDIT: Following confirmation from someone living in the other flat, my flatmate is certain that the door was shut and locked before his leaving. Also, there doesn't appear to be anything missing, though that doesn't rule out a break-in.