I am pretty sure that this is a Galium Carpet, named after the Gallium plants or Bedstraws on which its caterpillars like to guzzle. It has a good choice in the UK: Lady's, Heath and Hedge; a three-course meal for any Galium caterpillar lucky enough to be brought up within a crawl of all of them.
I have talked recently about the lack of blue in moths but the Galium is one which has a touch of it - very subtle but nonetheless there in that lovely, jaggedy band across its wings. I will try to introduce it to my granddaughter next time we read The Very Hungry Caterpillar.
Update: my wise commentor on this post is, however, correct. This is a Large Twin-spot Carpet, confirmed by Peter Hall on the Upper Thames Moths blog. So I will have to content myself with telling the GD about that, instead.