willl have to wait for a better day. was completely wet through by the time i got back to my car - saw a few gulls - coul dnt see anything at all on the water otherwise - not that i have the best bin's in the world but it surely would have spotted a gn diver if got a few gulls, unless it dived and moved back in an area i already scanned.
although a diver would be fairly easy to spot right - goose size if i remember correctly?.