UPDATE!!! he's back!!!!!
I am away on business but the wife and the inlaws went out looking for hours today and put up loads of posters.
Didnt find anything so the wife went back out after tea. Went back to the spot we found him a few weeks ago and there he was stalking rabbits!!!
He's totally fine and has a pot belly (rabbit not worms I hope), still didn't stop him devouring 2 packets of whiskas and a tin of tuna fish though!!
In his usual spot on his puffee sleeping it off, until next time I guess? And will I get as worried next time? Of course!!! :-))