Saw this warbler picking off insects from a bush in the garden of a holiday cottage in Orkney. It was largeish, and very noticeably VERY yellow underneath going right down the body, with only the hint of a supercilium. The photographs were taken through a window, so the vividness of the colour has been bleached out a bit, but I didn't want to lighten/brighten the image for ID purposes.
2013 photos & vids here
eff37 on Flickr
rspbailey said: Looking at the bird we must first rule out why it isn't the most common and simple answer - to me, here, Chiffchaff - and then look for more clues.
Think I've written a very similar point on many occasions on here! I totally agree. Often there are posts from people stating what it isn't, and seeking other suggestions, while the photo is strongly suggesting it is what it apparently isn't!
Re this individual, I'd suggest it's quite possibly an immature chiffchaff. If it is not, it's quite possibly an immature willow warbler.
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