Back in the Seventies a gang of us had an old Vertue sailing boat that was fitted with an Origo petrol stove, wondrous affair that was! Lighting it was a dramatic experience, especially in a gale when we were on our beam ends. Whoever fired the thing up was bound to lose the hairs off the backs of their hands and from well up there fore-arms. However, once alight it was the doggy's doo-dars, boil a pint seemingly in seconds. Condensation, what condensation?