Here's the turnout.
Here are the voter turnout percentages by constituency:
Barnet and Camden: 39.59%
Bexley and Bromley: 48.38%
Brent and Harrow: 37.09%
City and East (Barking and Dagenham, City of London, Newham, Tower Hamlets): 31.17%
Croydon and Sutton: 42.27%
Ealing and Hillingdon: 42.98%
Enfield and Haringey: 41.38%
Greenwich and Lewisham: 40.33%
Havering and Redbridge: 42.94%
Lambeth and Southwark: 39.13%
Merton and Wandsworth: 45.99%
North East (Hackney, Islington, Waltham Forest): 39.57%
South West (Hounslow, Kingston upon Thames, Richmond upon Thames): 45.26%
West Central (Hammersmith and Fulham, Kensington and Chelsea, Westminster): 34.98%
This ain't good for Khan but he'll probably pull it out