looks good to me at the moment i don't think we need to mention feral cats i doubt that it is common for feral cats to enter a house via a cat flap on the whole cats are uncomfortable with entering another's territory although i imagine it does happen occaisionally especially if a feral cat learns that there might find food inside if someone can find a useful reference on the subject we could re add it mind you i did once find a wood pigeon tapping at my girlfriend's cat flap which seemed particularly unwise