Don't know whether the scoter from Grimley hopped over here this afternoon but one was asleep in the middle of Upper Tank, which made it very difficult to identify. Half the time it looked like a buoy and I was ready to dismiss it (albeit a buoy that drifted with the wind, i.e. not much use). But occasionally the bird swung round to profile, revealing obvious feathers at the rear. Its pale cheek was visible all the time, so immature or female. I couldn't see its sticky-up tail though, which is a tad unusual.