Crambidae, Pyraustinae, Pyrausta purpuralis I would say. There are some others which looks almost identical, but I ruled all other out, since yours is quite a nice and typical example:
http://www.upperthames-butterflies.org.uk/Moth_files/Pyraustas_difficult_moths.pdf
Please, verify!!
https://www.flickr.com/photos/33398884@N03/6133301183/
http://ukmoths.org.uk/show.php?id=1182
http://en.wikipedia.org/wiki/Pyrausta_purpuralis
http://en.wikipedia.org/wiki/File:Pyrausta.purpuralis.7557.jpg
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