Bird With No Name

On Landing Stage of Worthing Pier.

Does anyone know what these little birds might be called. I have a closer view in my extra photo, but didn't want to crop it and lose what little definition there was.

My thanks go to Cailleach for hosting this great challenge on its 1st anniversary. What a wild and wonderful year of wild blips it has been.

Post Script : I have a feeling they may be Turnstones now, but still welcome any other ideas.