Heat oven to 220C/200C fan/gas 7. Rub a little oil over each potato and put on the top shelf of the oven. Bake for 20 mins, then turn down the oven to 190C/170C fan/gas 5 and bake for 45 mins-1 hr until the skin is crisp and the flesh soft.
Cut a cross on top of the potato, squeeze the sides, add a dollop of soured cream and your favourite topping. (Please note: the nutritional information below is for one jacket potato with soured cream and cheese topping.)