You may be able to help us with this one.
We saw two bird in the hedge next to our garden. Didn't get a great look at them, but it was about sparrow sized, with a pretty even, brown, thrush-like back, and a black face, not cap. You could definitely only see it when it turned its head.
As they flew off, they had a low, swooping flight, like a wagtail.
Anyone any ideas?