About 150mm high growing under Sessile oaks.
No interactions present.
Presumably this is either Polytrichum commune or Polytrichastrum formosum. given the height of the plant, it would suggest the former perhaps. From me book, the wetness of the habitat can give a clue to species - the wetter and taller leads to P commune.
Interesting and tricky things these mosses.
Lat/Lng: 52.3828, -2.3453
OS grid ref: SO765761