There were lots of these washed up among kelp on the beach at Lulworth Cove, Dorset.
No interactions present.
Ah yes looking at the other observations I see what you mean. That part is not illustrated in my guide book so I was misled. Embarrassed to not get even the Kingdom correct though.
Lat/Lng: 50.61928, -2.24563
OS grid ref: SY827799