Orange sponge/sea squirt
No interactions present.
This has rested here for 7 years with not even a comment.
If a choice HAS to be made from such a difficult picture then Sponge it is - but I cannot be certain.
This was showing as an Other Oganism, - both sponges and sea squirts are invertebrated.
My ID has proved Likely, produced clean ID and Taxonomy panels, given loads of Other Observations and has changed the group. Can't be all bad then!
THREE MARINE PROJECTS
Lat/Lng: 50.5, -2.5
OS grid ref: SY6576