As always, thanks for the appreciation, Butty.
Racoon and Racoon Dog were brought into the discussion by others, not me, so I thought it might be interesting to viewers, even if it doesn't bring us closer to a resolution of the OP's query.
My regular local birding spot, a couple of km from my house in the middle of a medium-sized city (pop, c. 350,000) - with a circumference less than 5km, and 145 bird species on my list so far - also has a small number of mammals, along with a variety of reptiles, and is a pretty good dragonfly spot, not bad for butterflies, and other insects.
We have had Tanuki (Racoon Dog) - which I am told used to be much commoner forty or fifty years ago - and (introduced, obviously) Racoon. (Both just a couple of times - I'm not claiming to see them every day.)
Here are photos of the two taken (at different times obviously) from very nearly the same point in my local spot. Just for fun. I wonder how many other members have seen these two species at the same spot?