Well, the lady feeding him told me he was, I felt between his legs as I couldnt check any other way, and was sure he was neutered, but the vet did check last night, and yes, he is neutered. I have dropped Sue at MyMoggy a line, so will keep him for 2-3 weeks to see if someone comes forward, then look at rehoming him. He has been sick today, and there was some odd spaghetti like stuf in it, so assume that is worms due to being Strongholded.
What has tickled me is that every vet and rescue I have spoken to today have asked if he was chipped - surely if he had a chip, I woudlnt be ringing vets, as I would have been able to trace an owner?