While conducting belated WeBS counts at Troy Mill I observed a late female Goldeneye congregating with several Tufted Duck. A female summered here last year and I suspect this is the same individual.
I have no real idea as to why she would choose to remain here throughout the summer unless she is injured in some way and can't fly and so can't migrate! There is no obvious sign of injury and was happily feeding throughout my visit. It will be interesting to see if she remains throughout this summer.