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Too late for early purples to be in this stage of growth now. Just the right timing for southern marsh though. It could always be one of the other Dactylorhiza group but this is by far the most likely.
Thanks Bob. I was just stunned to find this on a reclaimed pit top, which was still active until 1991.
Lat/Lng: 53.321359, -1.160051
OS grid ref: SK560808
Old pit tip, now reclaimed and showing good signs of naturalisation