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Thanks guys.... he can come and go as he pleases, tilly - as can they all. We went to bed about 00.45 and he was asleep on the sofa.
I've looked in next door's shed and the garage at the back with a broken door, and I asked the dustmen this morning if they'd seen him (or worse, found him) on their local round today. I've rung the local vet (not ours) just in case...
Yes rocky - same mog, but before, he got out of his basket on the way back from the vet's, he's never gone missing from home before :-(
If he's not back by lunchtime, I'll be knocking doors.