Aga cooking.
Advantage – no internal permeation of cooking smells.
Disadvantage – no internal permeation of cooking smells to remind you there’s something in there.
Indirect Advantage – when you’ve wandered out into the garden and got distracted by planting up a flowerbed, the cooking (burning) smells vent up the chimney, waft towards you and alert you to the impending conflagration inside the top oven.
Comfortably Mum 