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I'll not post an alternative but from the image here I'm not sure I could eliminated five-spot burnet. How did you do so?
Jizz essentially (from having peered at both next to each other a few times) - and a lack of the bluish tinge of the 5-spot,
Useful to know about the bluish tinge, not something I have picked up as a difference from my books.
Still not sure I can be confident which one this one I found last year is though - http://www.ispot.org.uk/node/174443
Tricky when they're not in the hand (I don't think I could have ID'd my own post from the photo alone) - for yours, the two pics on the right look to be the more natural colouring?
Handily, these were a couple of the species covered when I went on a caterpillar ID course run by Paul Waring a few years back...
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