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kwicher
IMG_8564.jpg  IMG_8565.jpg 
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Barrow Museum
Your fossil is the internal cast of a sea-urchin (Micraster sp) that lived in the Chalk sea some 80-90 million years ago.  Yours is preserved in flint, which is a form of redeposited silica, originating from dissolved sponge spicules, that occurs in bands within the Chalk.  Keep searching and you will find a complete one of this and probably other species as well. Micraster, commonly referred to as  a Heart Urchin for obvious reason, is related to the modern "Sea Potato", which is sometimes a frequent feature washed up on UK beaches.
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kwicher
THank you
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crusty_rusty59
Here's my first (and best) Micraster sp that I found in a flint nodule.1stfossil.jpg 
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Gary W
Very nice specimen crusty, it looks good still enclosed in flint.
Gary
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