Susan Hall has launched her election campaign to topple Sadiq Khan as the Conservative Party’s City Hall candidate warns the London Mayor is ignoring voters. Hall’s announcement came just days after Khan launched his third re-election bid alongside Labour leader Sir Keir Starmer. Hall, who was chosen as the Tory candidate last summer, will face off against Khan on May 2. She launched her “Listening to Londoners” campaign in Uxbridge on Sunday and highlighted local opposition to Ulez. Hall also criticised Khan over his record on crime and housing. She said: “Sadiq Khan has ignored Londoners for…