Jurassic Jim has a brilliant shop in Shanklin (IOW). He also has a fantastic site with some amazing fossils and artefacts. I have bought from him many times, and every time he was enthusiastic, and told me everything I need to know about the fossils I've purchased. He is really reccomended, as the fossils are unbelievably cheap for what they are...
Link to his site:
http://www.fossilshop.co.uk/
Link to his site:
http://www.fossilshop.co.uk/