Formula One legend Sir Jackie Stewart tells the Telegraph about his wife's worsening condition. Speaking at his Swiss apartment, Sir Jackie says that finding a cure for dementia is the most important race of his life. ► Read the full interview here: https://www.telegraph.co.uk/dementia/ ► Sign up to the Telegraph's free new daily newsletter, From the Editor, bringing you the latest news, features and analysis from the Telegraph newsroom: https://telegraph.co.uk/customer/secure/newsletter/from-