His more notable roles include the Fat Friar in the Harry Potter film Harry Potter and the Philosopher's Stone, and Dorium Maldovar in series 5 and 6 of Doctor Who.
Dorium Maldovar was a black marketeer in the 52nd century who owned a bar that gained its wares through questionable means. He was beheaded by the Headless Monks but his severed head, which retained its life and sentience, was kept in the Seventh Transept.
The convention is at Scarborough Spa on Saturday April 4 and Sunday April 5. Simon will be at the event on the Saturday.
Co-organiser Steve Dickinson “The Whoniverse exhibit at this year’s SFS is getting bigger and more amazing by the week, we are spoiling the Whovians this year with a total of eight guests, spanning decades from the hit BBC show."