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The stripe above the eye matched other confirmed photos i have. Does this vary a great deal in this species?
Yes, it really does vary. Some have the stripe very weak behind the eye, others are boldly marked like a Willow. The dark cheek giving effect of a bold, pale eye ring is a useful check for Chiffchaff, and the primary projection is clearly short, here.
My Flickr photos...
Lat/Lng: 52.7881, -1.3835
OS grid ref: SK416213