The perfect bluetit box

Karen I had to laugh yesterday when I saw one of my boxes (unused) at a jaunty angle on the fence. It looked as if someone had tried to 'kidnap' it overnight. Still not sure how it happened but we think maybe a wood pigeon had landed on the roof and taken off causing a bit of a thrust downwards or maybe a neighbour's cat...who knows...or maybe someone increasing their chance of getting a nest   We need to put another screw in it I think.