I came across four birds apparently feeding on and around an overgrown dry-stane dyke at the edge of woodland. I only managed to get photographs of one of them, as the others were partially hidden by vegetation. They looked like willow warblers, but their calls were a sort-of single-syllable "tcheep". (Didn't sound like chiffchaff either.) Could they be wood warblers?
Thanks, Tony. It definitely wasn't a typical willow warbler call. There are quite a few of them in the area and I'm familiar with both the song and the call. As I say, it was a single syllable, with a harder, thinner kind of quality to it. I'm less familiar with chiffchaff, but I have heard the call and am fairly confident I can recognise it.
Willow warbler would be the most obvious choice, as they are quite common here, and I've never seen wood warbler. Maybe they were Gaelic-speaking willow warblers! I can't take much credit for the photo - the bird helpfully perched in full view quite close to where I was standing. I'd been watching a thrush on the ground, and when I looked up, there it was on the wall.
Ah - you're right about too much colour underneath. It also seems too brown, rather than yellow, around the throat and breast. Blurred photo, but you can see that much.