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I don't think this is Asplenium trichomanes. The pinnules are too broad. Could it be a young Adiantum capillus-veneris? Or even Asplenium adiantum-nigrum?
I'm not too happy about challenging circuta58 but I really think this IS Maidenhair Spleenwort (Asplenium trichomanes).
I've seen many very similar daylight-deprived versions.
Certainly not Black Spleenwort (Asplenium adiantum-nigruma) this would have split 'leaves' (bipinnate?)
Maidenhair FERN would have, even in poor light, a few branches or twigs carrying additional leaves.
But see this one and ponder http://www.ispot.org.uk/node/212386?nav=related.
THREE MARINE PROJECTS
Lat/Lng: 50.1711, -5.1236
OS grid ref: SW770347