When I arrived at about 2:50 it was with 13 Sandwich Terns sat on the sand not far from the entrance to the beach.
Despite a Gymkhana going on nearby they stayed put for about 30 minutes before splitting up.
Most of them flew off but the Black Tern and a couple the Sandwiches only moved a few yards before settling again. It was still there when I left at about 3:30