Yes he is chipped. He has only been away 3 times since we got him at Christmas. No collar as he made so much fuss I did not have the heart to make him wear it. If he comes back though, that will have to change.
We moved four months ago and another cat keeps coming in the house and the garden, would that have something to do with it? Although this other cat tends to go for my other female cat rather than my missing male.