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A overwintering Adult from last year no doubt.
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We always used to call these the Devil's Coach Horse rather than Demon's Cart Pony although I suppose it is not that different
Think David is only joking but I like his take on the common name.
This one seemed too small for Devil's Coach Horse, although obviously the same family, which suggested pony (being smaller than a horse). Similarly demon being less than the devil and a cart being less than a coach.
Important rule though - if you need to explain the joke it's not funny.
As I said it seem too small for that species to me, but you're the inverts expert.
Lat/Lng: 51.540316447216, -0.32921433448792
OS grid ref: TQ159837