No shortage of Floo powder has ever been reported, nor does anybody know anyone who makes it. Its price has remained constant for one hundred years: two Sickles a scoop. Every wizard household carries a stock of Floo powder, usually conveniently located in a box or vase on the mantelpiece.

The precise composition of Floo powder is a closely guarded secret. Those who have tried to ‘make their own’ have been universally unsuccessful. At least once a year, St Mungo’s Hospital for Magical Maladies and Injuries reports what they call a ‘Faux Floo’ injury – in other words, somebody has thrown a homemade powder onto a fire and suffered the consequences. As irate Healer and St Mungo’s spokeswizard, Rutherford Poke, said in 2010: ‘It’s two Sickles a scoop, people, so stop being cheap, stop throwing powdered Runespoor fangs on the fire and stop blowing yourselves out of the chimney! If one more wizard comes in here with a burned backside, I swear I won’t treat him. It’s two Sickles a scoop!’