Titchfield Haven

Had to go and visit the m-i-l today but stopped off briefly at Titchfield Haven. Shortly after arrival a marsh harrier sent c100 lapwing up in the air. I then had a walk along the promenade there and saw hundreds of turnstones; some of them are so tame that they were milling around the feet of children who were feeding them seed. Lovely to see. I didn't have a camera with me so used my phone, hence the poor quality of this picture. It was obviously a tern but was different to the others, black head, dark beak and dark tail. I've looked through my reference books and I can't ID it. 

I'm a wanderer.