“My wife was the original pit lane girl, my professional stopwatch – timing my laps to the millisecond,” said Sir Jackie.

“Her razor sharp mind was one of the things I immediately fell in love with, and it is her mind that is vanishing.

“Her short term memory is shot – she never remembers where I am even after I repeatedly tell her.”

“I have in front of me my wife, my partner, who still has this feisty willpower but is not accepting that she has dementia.

“It is basically like having worthless determination.