Should be Aglais urticae. The older caterpillar are usually solitary. It is at the moment the most common butterfly in Europe.
http://www.lepiforum.de/webbbs/images/forum_2/pic5351.jpg
http://en.wikipedia.org/wiki/File:IMG_0368_caterpillar.jpg
http://en.wikipedia.org/wiki/File:Aglais_urticae_qtl3.jpg
http://www.ukbutterflies.co.uk/species.php?species=urticae
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