Sorry, not the best photos!
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I think that I would want to see this before going firm on D. filix-mas. If you look at the largest images, especially picture 2, then the pinna segments don't look very toothy or pointed and indeed may be crimped a bit and the pinna as a whole has a concave look - all of which hint at the possibility of one of the "affinis" complex.
There is a complete absence of scales on the stipe which affinis would show readily. (And no dark spot, but that is less reliable).
Lat/Lng: 53.201534, -2.885177
OS grid ref: SJ409675