About 6 mos ago, we realised that the bolt on the window of the spare room of our rented house was frozen. It's the bolt at the bottom, and the window is currently on the latch.
We reported it to the landlord and he tried to fix it with WD40 (we'd already tried this, obv) and it didn't work. He then sent us a letter saying that in general, it was tenants' responsibility to oil all latches and locks regularly, and if we don't, the frozen bolt is our responsibility and we need to pay for a handyman/ glazier to fix it.
I have tried everything I can think of - WD40, 3-in-1 oil, even taking off part of the catch to get at the bolt myself - but nothing works.
But, it seems to me a bit weird that people are expected to go around oiling window latches regularly. Is this normal? I have to admit I have never regularly oiled the window latches on any other property I@ve lived in 
Should I pay for a handyman? I'm a bit afraid it will involve taking off the whole window or something and cost £££ :(
Or is the landlord taking the P?