Original data from GROC : https://opistobranquis.org/es/guia/318
Author : Xavier Salvador
On salt marsh, a few metres north of the path next to the car park of the White Horse pub in Brancaster Staithe, south-east of the oyster holding pond.
(The diameter of the 1p coin is 20.3mm.)
See https://uk.inaturalist.org/observations/218060688 for comments on these by @morddyn.
See https://www.inaturalist.org/observations/105616385 for the only other record of Limapontia in England, which was about 500 metres away from this observation.