Tackle the problem early
I have been urging this young man to speak to the feeders in his estate who have been feeding the cats to get them sterilised. There have been a lot of complaints by the other residents and I have told him the town council is going to trap the cats. he has told me that he is busy, so are the other ladies (there are 4 or 5 unsterilised cats). Today the pest control came, and now he's panicking and asking me what to do.
If he had just sterilised the cats a little earlier, we would not have this problem.