Mystery solved by Sue J.
The mini putting course in front of the Old college was painted last time we were there and the bright blue paint matches that on the Redstart exactly.
Scaup still , but no Tarka.
Saw Purple Sands on wooden jetty @ 16:00.
Met Janet and several thousand Starlings later @ pier. Earlier met Black Redstart and ...at last...
Chris Bird ! The lovely guy who found it!