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