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Hope this helps a bit...We found many of these washed up on the beach among the seaweed. Some were long and seemed stretched out at about 6 or 7 cm, others very short and round. They felt a bit like jelly and had slightly rough looking skin. On some, I could see dark thin tube running through the middle.
Lat/Lng: 53.1857, -4.4889
OS grid ref: SH337682
We found many of these washed up on the beach with the seaweed. Some were very long and stretched out, others very short and round. I'd love to know what they are!