Are they confined in their outdoor area, or can they come and go? And how big is their space outside? DH and I talked about putting up a permanent shelter/enclosure for ferals, but he thinks it would be wrong to keep them penned up.
They have free run of all the surrounding fields, as far as they ever want to go. The road is a country road and not very traffic heavy at all.
They stay around because there is a 'porta-cabin' (christened the cat cabin)out back behind the paddock, filled with couches, armchairs, duvets, cat trees and food, so they know that they have a warm place with food and water around. Some of the cats have just wandered their way here and our only contact is to feed them, some were dumped on the road and integrated themselves with the group, and some are ones we released to join the colony after neutering, because they were just miserable inside the cat room, and were always terrified during cleaning etc.
Some do wander into the house as well, Little Hissy & Wesley come in occasionally, they are semi feral, it depends on their mood