Warbler

I went to the bird hide at Kinghorn Loch this afternoon but not much going on. The bird-feeders were all empty so that wasn't drawing in the usual culprits.

I managed a couple of distant shots of warblers. One was a willow warbler but the other was this yellow creature that challenges my identification skills. The closest match that I have come up with is a Wood Warbler. What makes me slightly unsure is that a wood warbler should have a white belly that I don't see here.

[EDIT]
Thanks to MOLOH, This would appear to be a juvenile willow warbler.

The quality is rather poor because it was rather distant and has been tightly cropped.