There are a bunch of stray Tom cats locally who are quite friendly - so not feral - but not microchipped or seemingly owned by anyone. They've been reported to the RSPCA and Cats Protection but they're full to bursting and can't take them at the moment.
Would it be a terrible thing to book them in to a vet for neutering, then put them back? My thinking is then at least they won't be fighting over females or getting them pregnant.