In reply to cb294:
> Almost looks more like a yellow breasted / black belly striped coal tit. I know that great tits are quite variable in both size and colouration, but this bird is a bit outside the expected range. Unfortunately I have no idea about its voice.
> CB
Shout, "Arthur Scargill" out of the window next time it comes back, if it looks up it's a coal tit, if it ignores you it'll be a great tit.