HOT SHOT: Jackie and friends.

Every living Formula One world champion, including Michael Schumacher – with the help of his wife Corinna – has just signed a very special helmet. It was worn by Jackie Stewart, complete with his signature tartan strip, during a demonstration run in his 1973 title-winning Tyrrell 006 at the Bahrain Grand Prix. The helmet will now be sold to raise funds for the fight against dementia, a disease affecting Stewart's wife Helen and his old mate Allan Moffat.