Hi,make sure you heat the oven 1st ,put it to gas mark 7 and cook it for 12-14 minutes or until cheese has bubbled and slightly browned,make sure you put pizza into a HOT oven.Enjoy
Very hot oven, and place your pizza on the top shelf, should bedone in about 15 minutes, just open the door and check it, the top need to start to brown. About 325 C