Blackcap?

[nigheandonn]

The RSPB guide makes it look like a blackcap should have a white face, but I'm not sure what else it might be.

[jmarkb]

Definitely a blackcap. They do have a pale throat and underparts, but the RSPB picture does over-emphasise this compared to photographs.

[Alteknacker]

Agree with jmarkb. The other absolutely defining feature of the blackcap is its song (though having said that, it's quite similar to that of the garden warbler ).

[nigheandonn]

Thanks both!

It wasn't singing, just dotting about. It made me think of a wren with a black hat on!