There should be a small hole (5mm) in the metal belt cover towards the front of the cam cover, which lines up with the back of the pulley. Put a punch through here and tap it with a hammer. The pulley should come straight off.
Mikki x
Thanks, Mikki. I see a mark on the back of the pulley, now that it's off, that looks like someone had done that before. Wondered what that hole was in the cover for. Now we all know.