In reply to Bottom Clinger:
I saw two on Blackford Pond in Edinburgh's Morningside this afternoon. I usually see at least one. They seem to be fairly habituated to the dog walkers, runners & buggy-pushers that typically frequent the place, although they still tend to keep more to the middle of the pond than e.g. the mallard and mute swans. No more wary than the tufties, though, really.
Post edited at 15:37