I am starting to change my mind, and lean a little more towards Adonis - I was a bit thrown by the extent of orange on the upper wing, but looking at further books shows this to be less uncommon than I had thought.
(Collins Tolman & Lewington shows no orange at all!)
Adonis is now my best guess.
Roger
![Embarassed :oops:](./images/smilies/icon_redface.gif)