I suspect with where it was parked, it was visiting rather than living there - I’ve also not seen it before, and it was parked near our favourite eat in chippy lol
I’ve got a little time off work, so we’ve spent quite a bit of time walking around our local reservoirs (we have a lot of them in the Bolton / Rivington area lol).
Spotted this in the car park :
Side note : This particular reservoir (Entwistle) was quite low due to maintenance work :