By Jessica Frank-Keyes Labour’s Sadiq Khan has been re-elected to City Hall for a historic third term as he cruised to victory in the London mayoral elections. Khan secured just over 1,088,000 votes, compared to Conservative rival Susan Hall’s 813,000, delivering him a majority of some 275,000. The incumbent mayor, who has been in post for the past eight years, was re-elected as he snapped up support across the capital, despite turnout across London being down from 2021 and 2016 on 40.5 per cent. It came despite Conservative briefings on Friday suggesting Hall, a former Harrow council leader a…