Thanks Janee for the risk assessment, it is exactly the route I was taking.
The new cat has settled very qiuckly, almost too quickly, as he is giving my existing cat a bit of a hard time, Maverick my existing cat is a very tough cat, to the extent that the few other cars in the vicinity run away when he is out. But he is no match for the new cat, so we are keeping them apart at present. Any ideas as to how I can get a little harmony in the household.