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It also has unspotted leaves which sheathe the stem...so I agree with southern marsh.
I've just got to grips with accessing BRERC data, which shows Southern Marsh Orchid in this and an adjacent 1 km square.
Things have certainly moved on since the pieces of squared card with stencilled maps of Oxfordshire on them that I remember the late Stan Woodell working with in the 1970s.
Lat/Lng: 51.47787, -2.477209
OS grid ref: ST669755