This is Hedgerow Cranesbill Geranium pyrenaicum, noticed and identified on the spot by Steve, our friend from Sowerby on the walk on Sunday 6th September. Its flowers are about 15mm (5/8inch) across.
The only site mentioned in West Yorkshire Plant Atlas (Lavin and Wilmore 1994) is in Halifax -
Bolton (1775) 'At Lower Willow Hall, Skircoat.' Doubtfully native, with a first British record in 1762
(Clapham, Tutin and Warburg, 1962). An uncommon West Yorkshire species recorded very occasionally from hedgebanks, waste ground and field margins.
Steve spotted this - a single plant - on an unmown verge of a farm lane at Bradshaw. SE075306
Great find Steve, from Steve B. Will try and get to look at your Hypericum at Sowerby Bridge.