Susan Hall is closing the gap on Sadiq Khan as the mayoral race hots up with dramatic shifts in voting intentions in Inner and Outer London, a new poll reveals.The exclusive YouGov survey puts the Tory contender on 27 per cent, up three points from February, and her Labour rival on 46 per cent, down three points.Mr Khan still leads by 19 points but this is down from a 25-point gap in February.Green Party candidate Zoe Garbett is on nine per cent, Liberal Democrat Rob Blackie eight per cent and Reform UK’s Howard Cox six per cent.Election experts expected the polls to narrow around this time as Londoners focus more on the contest itself.