The good news is that he is found. The not knowing had been horrible.
BUT the poor cat has been in the wars. The sweet man who brought him back said that his injuries were due to a trap. Totally illegal but used by some (I hesitate to call them people) to protect their hen houses.
After another trip to the vet where she operated he has had to have one back leg amputated and lost a toe from the other back leg. The vet says he'll be fine on three if he survives the infection in the other which he seems to be fighting well.
We have also had a visit from the countryside police - I can't remember the long french name - who were also appalled and strode off to locate the nearest hen houses.