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I understand why you see this like one of the Belles but alas its the very common Shaded Broad-bar. Never had either Belle myself but hoping.
Thank you for the confirmation, I've amended the observation accordingly. The two species are right next to each other in my book - not sure why I didn't see it!
Its just a bit faded and maybe not so well marked/coloured as the SBB in the book- certainly lacking the colour of a really fresh one.
Lat/Lng: 52.5, -1.6
OS grid ref: SP3094