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Hi...as you were very helpful on the last fossil...thought I'd show you this special find I have.Found it on a beach in East Yorkshire this time...it's about 5cm x 4cm....just curious about it...
It is a fossil sea urchin (echinoid).
It looks like it is preserved as flint.
Here's a very good place to start with echinoids
Yours is one of the irregular types.
Because it has had a lot of erosion, not much is left of the details, so further ID would not be possible and/or would entail a lot of (pointless) speculation.