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The look of it makes me want to say P. asplenioides, with its teeth on the edge of the leaf and its pale translucent-ness. More knowledge is required though.
but some indication of actual size of leaves would help.
Not sure if the second image i've added helps with size.
Now that an ID has been added my other Plagiochila has come up in the 'other observations' section. From rather hazy memory this other observation appeared to be a bigger plant even though it was growing in completely different kind of conditions (drier woodland) in a different part of the country.
Lat/Lng: 51.22102, -3.927401
OS grid ref: SS654486