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I think i may have stared at your picture too long but at some point i decided it was a Barbula from what i could see of the substrate, leaf colour and shape and the seta/capsules (which i am taking to be undeveloped with the exception of 3 or 4 to the forefront/bottom of the photo).
I went with convoluta over unguiculata as no matter how hard a stared i could see no ex-current leaf nerve. However, i am unsure of lighting (and colour-blind) and it may be that the seta on the developed shoots are reddish which would indicate unguiculata.
Then again i could be wrong altogether! I look forward to other opinions
Thanks, if i get the chance i'll nip back and see if the capsules are fully developed and may take more of a close up
Lat/Lng: 51.9586375, -0.64091972222222
OS grid ref: SP934297