By Jessica Frank-Keyes Canary Wharf Group chairman Sir George Iacobescu is among dozens of business voices backing Sadiq Khan ahead of Thursday’s mayoral election. The property tycoon, who also served on a City Hall post-Brexit business advisory panel in 2016, joined more than 80 business figures across the capital endorsing Labour’s incumbent mayoral candidate’s campaign. Other names backing Khan included Paul Drechsler, the ex-chairman of lobby group Business LDN; former Tory business advisor Iain Anderson, who is now counselling Labour leader Sir Keir Starmer; Jeremy Rees, CEO of Excel Lond…