It's not a great field, is it.
www.bbc.co.uk/news/uk-england-london-55748037
My thoughts reading through this list.
Shaun Bailey, Conservative - I can't vote Tory. Next.
Kam Balayev, Renew - need more info. The huge picture makes him look someone trying to sell a hypnosis course.
Sian Berry, Green Party - I'd rather take out my own teeth one at a time with pliers than vote for her or her party, given their recent form.
Count Binface, Independent - I may have to vote for him (or her - who knows what may be under the bin?).
Valerie Brown, Burning Pink - ooh, she's a Black woman, not in her first youth, what does she say about herself? 'Burning Pink's candidate describes herself as a mother, grandmother and 
vigilante.' OK, moving swiftly on ....
Piers Corbyn, Independent. FFS.
Drillminister, Independent. ???? SE London born. Real name, age etc unknown. Hmmm.
Laurence Fox, Reclaim Party. No, no, no. We don't need another blond attention-seeker as Mayor.
Peter Gammons, UKIP. 
Nominative determinism.
Sadiq Khan, Labour. Predicted to win by a landslide, so he won't miss my vote.
David Kurten, Heritage Party. 'sits with the Brexit Alliance Group on the London Assembly.' No.
Farah London, Independent. Will look into this one further.
Winston McKenzie, Unity in Action. 'The 2016 Celebrity Big Brother contestant is founder and leader of the Unity In Action party.' Wikipedia says he has been a member of every single political party at some point, and having failed to get elected anywhere he's now set up his own party. No.
Nims Obunge, Independent. Sounds well-meaning enough.
Luisa Porritt, Liberal Democrats. LibDems don't want my vote, so that's easy.
Rosalind Readhead, Independent. Deep Green, supports Extinction Rebellion. I'm sympathetic to much of what she says but I don't like ER.
Mandu Reid, WEP. Sorry, Mandu, until your party works out what a woman is, you don't get my vote.
Brian Rose, Independent. YouTuber, conspiracy theorist, anti-vaxxer, serial interviewer of David Icke. Another FFS here.