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...be good to edit and move to plants :)
I am not looking for agreements, Graham's is as likely to be as right as mine (I cannot be certain).
However, since about 2015 it has been possible to Re-Group by adding an ID - it was, for at least 4 years, an Other Organism
My ID has done just that and given it a Likely (to Graham's), Other Obs and is seen in Other Obs too. Full house then.
EXCEPT, this might, just might be Dulse - Palmaria palmata.
Lat/Lng: 50.6607, -1.9493
OS grid ref: SZ036845