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More likely to be a Chiffchaff, I think. Legs look dark, eye shows prominent pale ring, wings appear short and overall shape looks Chiffy.
Difficult to be sure from the angle.
My Flickr photos...
I agree with Ian.
Thanks guys, it didn't hang about long enough for a good look.
Lat/Lng: 51.3, -0.2
OS grid ref: TQ2657