A neighbours cat went missing and we stuck posters on the lamp-posts and dropped leaflets through the doors of everyone nearby. That prompted the next door neighbour of the cat owner to check his shed and there was TwigletHave you knocked on all your neighbours doors and asked them to check their sheds and garages? That's the most likely places. This time of year people go in/out much more so he's more likely to get accidentally shut in. Plus if he was injured or scared that's the sort of place he will bolt to.