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Not an easy one to be sure of. There appears to be a reasonable primary projection, suggesting Willow, though the angle is not great to judge. The cheek patch is also pale, suggesting Willow. However, the supercilium is indistinct, and certainly is narrow over the eye, more suggestive of Chiffchaff.
I agree, though, probably a Willow Warbler. They are never as easy as some people might tell you!
My Flickr photos...
Lat/Lng: 51.1, -1.5
OS grid ref: SU3544