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...be good to edit & move to plants :)
We don't have white seaweed in our waters - this is either porphyra (red algae) or ulva (green algae) which has been bleached by the sun. The reds are better protected than the greens - my bet would be for ulva (sea lettuce).
Lat/Lng: 50.6636, -1.9478
OS grid ref: SZ037848