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Certainly looks like a pyralid, possibly melanic. It would be good to know the size and whether the colour is a true representation.
From memory about 18mm forewing i.e. medium size macro, bigger than most pyralids. But my memory could be wrong, I din't keep any notes on this occasion. Probably beyond id.
Colour - probably not brilliant but that's what the image captured and i can't add to it.
Paul Seligman. Flickr: http://www.flickr.com/photos/paul_seligman_cardiff/collections/721576087...
Looks to be an underexposed photo taken on a white background; when I lighten the picture up I think I can see markings consistent with U. prunalis. Might be my over active imagination!
Zooming in on original of image - legs do look white. But sometimes flash can cause that.
Lat/Lng: 53.9597, -1.5468
OS grid ref: SE298516