My first new bird, well, taxa of the year. A stunning male Caspian Stonechat at Titchfield Haven. I wrongly aged it as a 1st-summer on the basis of the worn primaries. It is in fact a 3rd-cal year/adult on the basis of the uniformly black wing coverts. Adults commonly show a brownish hue to the primaries. Thanks to Grahame Walbridge for clarification on this.
Only the sixth record for Britain and so, an excellent find by Amy Robjohns.
I think the amount of white in the tail favours the Northern form S.m.hemprichii being about 50% of tail base being white. There is obviously some overlap though between the Northern form and the Southern form S.m.variegatus, but there would have to be less white in the tail for this bird to be considered of the latter form.
Some more pics of this beauty.