1) Loads and loads of cats - so some will always go missing, but it just seems like a lot
2) They are all choosing to live in the feral cat colony up in the choumert rd car park (gangs for cats)
3) There is a cat rustler (making cat pie or a cat fur coat? Or just selling them on)
4) They are being 'got' by something like a fox (unlikely)
Anyway... am going to keep musing this...