thanks again all. I am at work and have had posters printed up. Only 25 as they were a pound each and I need to keep some aside for the reward. He will probably be there when I get home tonight but if he is not I can distribute these to neighbours and have more photocopied tomorrow at work when no-one is watching. I have contacted all the vets, the RSPCA and am trying to call PDSA but their phone seems to be off the hook. We don't appear to have a Celia Hammond here. Anyone in my area who wants a poster, I can email them to you if you PM your address.
It has been suggested that he may have found a girlfriend which I guess is not impossible at five months, especially as he is such a precocious lad, if so I hope he does not get beaten up by more mature males - or catch something nasty...
Fingers crossed he is there when I get home. It is so wet and miserable he may have preferred to stay where he is if he is comfy and warm ...