By Jessica Frank-Keyes Sadiq Khan says he wants to make London’s rivers “swimmable within ten years” in the face of the sewage scandal. The Labour candidate for mayor of London has unveiled his manifesto, revealing a series of key campaign pledges under the slogan: A Fairer, Safer, Greener London. Khan, who is running for a record third term at City Hall, set out his plans for inequality, housing, policing, transport, the environment and business in the 70-page pamphlet. One key pledge in his ‘Greener London’ section saw him vow to take on Thames Water and to “develop a bold plan for swimmable…