Preheat the oven to gas mark 7 or 220 degrees Celsius.
Place a roasting tray in the oven with a generous amount of oil.
Peel the potatoes, rinse well, slice into halves or quarters (depending how large they are) and place in a pan of boiling water.
Boil for 10 minutes maximum then drain the water.
Place the lid on the pan and shake the potatoes (these is the most important part for crispy, fluffy roasties!)
Place the roast potatoes into the tray of hot oil, season well with salt and pepper and place in the oven.
Roast for 20 minutes, turn the potatoes over in the oil ensuring they are coated, then return for another 20 minutes.