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Found on Skegness beach after tidal surge.
Not a bone, but parts of the exoskeleton of a crustacean. Crab possibly. I can see some pleopods - appendages used for swimming or egg-carrying.
There are already photos of this on another thread. It is from a large cartilaginous shark, I initially thought it was from a ray but bombuslucorum suggested a basking shark and I don't disagree with this.
I'm wrong again, but happy to get the correct ID from those who know better.