Also spotted that fluffy black cat that I've been seeing around here on-and-off for the last six months or so. I'm not sure if it belongs to anyone, but it *could* possibly be one of the Rodent Control Officers from some of the various nearby stables.
It's thin, but not too thin, and a little bit scruffy. Not overly concerning, but it's not got the neat and sleek look of an "owned" house cat. Having said that, I've only ever seen it from a distance before - this is the first time I've managed to get a good look at it. Didn't determine the plumbing arrangement because of the coat, but going by the lack of jowls, I do not think it is an entire male.
Madam Lexi, who was dozing on the drive, was completely oblivious to it until I started talking to the other cat, who looked like it wanted to drink from the water bowl I keep by the front door in warm weather. Black cat trotted off into the hedge and the Lexter went into "prowl mode" but didn't fluff up. It does make me wonder if she's familiar with this cat...
I think the way forward will be to try and trap it, check for a chip (unlikely, but always worth checking), do bloods, neuter if needed and try to establish ownership.