I can't really add to anything much more than @BareNecessities has said other to say that when my partner lived in Birmingham (which has a large stray/feral population) if one contacts the RSPCA they'd come and collect them, neuter them and return them trimming a bit off their ear to show they'd been neutered and could be left to their own devices. Probably worth giving your local office (or Cats Protection as neutering is one of their primary objectives) to see what they can do.
@Dammit
I can't really add to anything much more than @BareNecessities has said other to say that when my partner lived in Birmingham (which has a large stray/feral population) if one contacts the RSPCA they'd come and collect them, neuter them and return them trimming a bit off their ear to show they'd been neutered and could be left to their own devices. Probably worth giving your local office (or Cats Protection as neutering is one of their primary objectives) to see what they can do.