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The very similar Lesser Swallow Prominent has a broader, shorter, pure white wedge mark in the trailing corner of the forewing. In the Swallow Prominent this mark is thinner and greyer and extends to about halfway along the trailing edge of the wing as in the example in the picture.
The wedge leading from the trailing edge is too long for that of the lesser swallow prominent.
Will post up a lesser swallow prominent shortly
Lat/Lng: 52.1307, -1.8597
OS grid ref: SP096480