Long fronds closely spaced leaves
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You may well be right though I had read that Polytrichum wasore common on high ground
I'm pretty certain it's a Polytrichum - P.commune is a plant of wet acid moorland, but can be found in a variety of other locations - it's possible it's P. formosum, but I'll wait for a bryologist to check the observation :)
Lat/Lng: 51.2, -0.8
OS grid ref: SU8955