Your fossil could be an echinoid. Whole echinoid shells (called testes) and individual spines are sometimes found in Jurassic and Cretaceous (190 - 65 million years old) sedimentary rocks. Sea urchins, as they are commonly known, can be found around the coasts of Britain today and are closely related to starfish. Echinoid fossils are not found in the rocks of the Potteries area.  
If you want to try and identify your echinoid fossil more precisely, you could search the Virtual Store or could take it to your local museum to be identified.
Click here to search the Virtual Store.