Thank you for the advice.
The cat hasn't left really since coming here, he has only left to go to the toilet.
I think i'd wait a good year before getting him netured due to the circumstances.
If my cat had gone missing for 5 days i'd be out looking for him.
I think one of the other problems apart from being territorial is i think this cat is younger than ours and he's very playful and keeps chasing our cat as part of a game and our cat just hisses at him. Our cat is only 2 at the most.
We've given him plenty of oppourtunities to go home.He gets on with my daughter too.