Confidence: I'm as sure as I can be.
Notes: Lovely picture of a long-tailed tit. You will see pied wagtails up in trees like this, but usually just when they are roosting. When you get to know the plumage pattern, they are very distinctive (and although they are a similar size and shape to pied wagtail, they are quite distinctively different). Also, if you get good at bird calls, long-tailed tits have a couple of distinctive calls, and you can often hear them before you see them.