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Not at all sure about this but the more I look at it the more I can convince myself it is a young Whitethroat. Would suggest it is very likely one of the warblers.
When I was taking these pictures, whitethroats came straight after this bird. The only reason I did not think it was whitethroat is because it hasn't got that typical scruffy/ruffled look as they usually do.
It is is a very safe guess probably.
Thank you for your help!
It won't have that rough look since, as Ray suggested, it is a juvenile, with much fresher, smoother plumage.
My Flickr photos...
Title edited post ID.
Lat/Lng: 51.4065, -0.1905
OS grid ref: TQ259690