This was Haliclona oculata, & when I looked for an old post using 1st the search box & then the species dictionary,
https://www.ispotnature.org/communities/uk-and-ireland/species-dictionary/NBNSYS0000175617/haliclona , it wasn’t there, & I had to look through my posts to find it.
https://www.ispotnature.org/communities/uk-and-ireland/view/observation/92341/haliclona-oculata50
Nevertheless it did have a likely ID as H. oculata,& there were 2 more H. oculatas in the other observations. (I checked & now if you ID a post as H. oculata it doesn’t get a likely ID)
So I had to re-identify it as Haliclona (Haliclona) oculata to get it in the lists
(NB that means the wikipedia & Enc of life links don’t work).
But having done that the 2 other H. oculatas were now totally lost, ie there’d be no way to find them on ispot- except from my history, so
https://www.ispotnature.org/communities/uk-and-ireland/view/observation/148495/mermaids-glove
and
https://www.ispotnature.org/communities/uk-and-ireland/view/observation/150142/sponge
How many other posts have been lost similarly by this change to trinomials, & why abandon the binomials as it’s the genus & species that identifies the creature?