Domestic garden on the edge of moorland slope in a small village
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Those wing tips look a bit too rounded for both CG and NR. Have you ruled out the borealis form of Ruby Tiger?
The shape looks okay to me for Cousin German (and I don't think it is Ruby Tiger), but there are very few markings to go on. I've never seen Cousin German and don't feel confident enough to agree the ID, but equally I can't see any reason why it isn't Cousin German.
Entomologist and biological recorder
Lat/Lng: 57.3, -4.3
OS grid ref: NH6427