WHISKERED TERN in Hampshire this evening

Noticed this sitting on a marker buoy, very distant off Gilkicker/Stokes Bay car park, at 18:38. Viewed on maximum zoom of my scope and light wasn't good so I phoned Dan Houghton for a second opinion, and he came over pretty speedily, was happy my ID was correct, so we then put the news out. As the light faded it was actually easier to see the plumage tones. Apologies to those who arrived too late, just after it flew off! It seemed very happy but was pushed off by a gull and flew off east at 19:23. I presume it had been there when I arrived at 18:15. A tiny bird, Little Tern sized when perched, but all black cap just extending over eye, strongly demarcated white cheeks, dark grey body with darker belly and v. short legs. Bill seemed all black. Potentially it could roost in the Solent overnight and fly past Hayling tomorrow morning! Also one probable RT Diver, 14 Sandwich Terns, 26 Whimbrel and 3 commic terns on the same buoy in near darkness when we left  (John Norton)