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I found this at the cliffs on the Isle of Sheppey and have not got much idea of what it is... my best guess I some form of starfish but im probably wrong... any help would be appreciated. :-)
Interpreting the single photo as best I can, it is an echinoid (sea urchin, related to starfish; both in the Echinodermata). The top happens to have been broken off, revealing some of the internal structure, the main bits being part of the mouth. That is a biologically unusual structure called Aristotle's lantern. Here's a cut-away illustration - http://www.nhm.ac.uk/research-curation/research/projects/echinoid-directory/morphology/regulars/lantern1.html
From the central position of the mouth, we can say it is one of the regular echinoids (one of the three main types, as explained here - http://www.nhm.ac.uk/research-curation/research/projects/echinoid-directory/morphology/morphology.html).
Further than that is just guesswork, based on the photo.
But, based on the location, one could speculate it to be Coelopluerus wetherelli or (less likely, going on the shape) Schizaster sp.
Very nice find and a fantastic image.
I have learnt a lot because of this specimen and the extensive reply that Mike has helped us with.