Today I was called to a flat in Aveley where the owner could not get in evening though he had the key, I tried to open the door with the key but the latch was not retracting after trying various ways to open the door it still would not open. After lots of drilling and patience we finally got the door open no damage to the door itself.i have a roller bolt nightlatch on the van fitted it to the door. After looking at the old nightlatch it was a cheap trade make and the working parts inside and failed