if it was me, i would have kidnapped it already! can you not buy some cheap flea stuff (like bob martin) from a supermarket and do him any way and give him a bit of food? i know that's kind of encouraging him, but i reckon he sees you as a bit of a soft target anyway as he keeps coming back to you. i have two cats i have rescued already and there is a little skinny ginger tom loitering around my garden as well. i am going to offer him some food next time i see him as he is so skinny i feel sorry for him. this is why i am a nurse and not a vet - i would bring evrything home with me if i was. people are much easier to refuse as they can be so repugnant! i love cats and when i was a child, i managed to find three strays, two rabbits, countless lame birds and even a ferret. i think my mum was very relieved when i left home! x