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Not a Reed Warbler...any other pics?
My Flickr photos...
I have added 2 more shots of the same bird
With it's rather grey upperpart colouration, and white underparts, I wouldn't be surprised if this was of the slightly larger, northern acredula subspecies on route to breed in Scandinavia.
The location and date would fit, but it's not possible to be certain from these photos.
I had the same thought, based on the lack of colour, but agree you can't tell from the photos.
Lat/Lng: 57.311, -1.996
OS grid ref: NK003244