I know its a bit late, but thought you may like to see ours....
An 'ex-feral' .. we know he is as he has been subjected to TNR with left ear clipped. Came to us 2018 and found on the lawn eating bread! and didn't go away. Set him up with cat igloo in the greenhouse where he slept for 4 months and ate his food on the picnic table. One cold December day we let him into the house for his food and he jumped up onto a chair and fell asleep! Been with us ever since...he had trip to the vets for blood check, vaccinations and micro-chip, all after a plea for any owner was met with nil response. During lock-down he has 'bonded' with our older cat and she now waits at the patio door for him to come in at night.