In case you wondered I found the identification by looking at the moths in a very battered copy of the Collins Pocket Guide to Insects, a gem of a book, not too good on detail for aquatic insects or any other tricky ones come to that, but an excellent all rounder.
The only moth that looked anything like yours in the book - apart from the Burnett moths as noel rightly says - was a micro moth which has a dark body and a couple of large bright blotches,
Pammene regiana.
I did a google image search for Pammene and your moth was there. As you can tell I'm easy to distract!
Here's a pic of
Pammene regiana