Broad leaves from base with faint purple-ish blotches
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Do you mean Dactylorhiza?
Dactylis is a genus of grasses.
This is likely to be Orchis mascula?
That's a bit embarrassing. Certainly did not intend Cock's-foot to be my suggested ID but even so I think you are right - more likely to be an early purple orchid.
Lat/Lng: 52.5596, 0.8397
OS grid ref: TL925995