A quick update, although no real progress.
The neighbour who phoned last night has had a look at the front door and there is no obvious damage ( I can’t rule out the inside of the lock being damaged, but am very pleased that the property itself seems secure).
I did eventually silence calls and went to bed. I missed a call from an unknown number at 4.40am - it’s probably a good thing for that person that I didn’t answer at that sort of time.
I have plans for today which don’t involve me going anywhere near the flat and in the cold light of day have decided that I was overly anxious to help yesterday as it was late at night on Boxing Day and I felt sorry for someone who was locked out. My spare key is no longer on offer to anyone but the formal tenant.
I will be arranging to go and see him when he returns to the U.K. to discuss the situation regarding his friend and also appropriate timing of contact for non emergencies.
I have to be available in case of true emergencies such as a major leak or fire, but someone locking themself out does not come within that category.
I had a good look at the Tenancy Agreement to remind myself of finer details. It states that I do not offer an unlocking service and they need to employ a locksmith at their own expense and risk.
I don’t mind the tenant contacting me during normal hours. If I am in the area and have my keys with me of course I’ll pop round and let them in for free, but out of hours in Boxing Day is not really on.