Thank you very much! I like to think of it as an early birthday present after missing out on phalaropes at Hillman last week...
As far as I could tell she seemed completely unperturbed by people - she was originally about 15m offshore but slowly bobbed closer to feed in the shallows and in fact flew in towards me sitting on the rocks to about 5m (at least according to my camera's exif data). There were dogs swimming along the shore ahead of and behind her, though, which is about when she bailed.
I'm shooting with a 300mm f/4 and a 1.4TC on a D90.