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Love the black stems... can't wait for a fern expert to ID it!
(Have abandoned ferns for conifers, as I'm still shaky on them: will return to ferns later on, honest.)
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
It is oak fern.
Lat/Lng: 56.6789, -3.243
OS grid ref: NO239548