Leaves three lobed
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I have another one to post from a different location that I'm confident is Druce's. The veining is much more distinct than on this. But I think you are right as the leaves are very similar on both.
... one of the common varieties has quite dark flowers, and is recognisable by the colour of the flowers being variable on a single plant.
But Geranium versicolor, Geranium x oxonianum and Geranium endressii are all rather similar, so unless you are familiar with the variation in foliage in all three I would be cautious about using the foliage to discriminate.
Lat/Lng: 53.6985, -1.8706
OS grid ref: SE086224