I am new to orchids, so don't know what to look for. These appear to be prolific in this field and two others nearby, but I could be missing subtle variations. These have plain leaves.
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Lat/Lng: 50.8375, -0.8017
OS grid ref: SU844049
Grassland that appears to have been uncultivated/ungrazed for years. I don't know this field well, but likely to be seasonally wet (other areas nearby flood).