Terry Robinson has emailed to let me know he had a flock of 25 Slender-billed Gulls at Polichnitos Saltpans on 7 November. His previous highest count is only seven, and I've never heard of a double-figure flock being reported before, so I make this an island record count! 17 stayed on until the 8 Nov (see photo above).
Slender-billed Gulls - record count!
Slender-billed Gulls, Polichnitos Saltpans 8 Nov 09 © Terry Robinson