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Araschnia levana ssp. levana f. prorsa
You're right Malcolm. That's why unidentified spotting should always be accompanied by a minimum of description, such as size :-) The Map is on the small side for a nymphalid (max. male wingspan 38 mm, against 64 mm for the White Admiral). The main distinctive feature on the dorsal view though are the two orange dotted lines running at the edge of the wings for the Map.
Thanks Daniele, my book only shows the spring brood. It's difficult to tell the size from the photograph, unless you happen to know the plant.
There is a resemblance with the White Admiral, but this the the summer brood of the Map butterfly. The butterfly is also smaller than the White Admiral.
Looks close to White Admiral, need to check further when I get time.