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It might be Early Purple Orchid (Orchis mascula)
According to Rose's Wild Flower Key; if the blotches are arranged
lengthwise then it's Early-purple, if they're transverse (as in this case),
then they're Common Spotted or Heath Spotted.
I remain unconvinced see http://www.ispot.org.uk/node/257101 where there are lengthwise and transverse on the same plant.
Thanks Martin, your point is well taken.
Lat/Lng: 51.0872, -0.9372
OS grid ref: SU745325