I would not expect terns to have that barring on the tail feathers (except perhaps for a sandwich tern - but they have black legs) and (unless my sense of scale is wrong) those feet look a bit bulky for any tern.
I'll check to see which other gulls frequent the Lido.
Ah, so the distance is genealogical rather than geographical.
@mespilus started
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I would not expect terns to have that barring on the tail feathers (except perhaps for a sandwich tern - but they have black legs) and (unless my sense of scale is wrong) those feet look a bit bulky for any tern.