Roast potatoes need 25 minutes at gas mark 7.
Bake them at 180 degrees Celsius or gas mark 4 in the oven, for about 20 minutes.
Place in a preheated oven at 220 C / Gas Mark 7 for 45 minutes turning a couple of times.
Method preheat oven to 180ºC, gas mark 4. Grease a baking tray.