Sian Berry

London Mayoral candidate says disagreements over trans rights within the party have resulted in 'mixed messages'

Party's longest-serving leader to leave role this summer, triggering fresh leadership election which is expected to be held later this year

Conservative Party leader and Brexit Party leader were only two not to attend Climate Leaders Debate last night on Channel 4, where politicians sparred over best way to hit net zero

Broadcaster invites Boris Johnson and Nigel Farage to join leaders from Labour, Lib Dems, Green Party and the SNP in head-to-head debate

Councillor Bartley will continue at the helm for a further two years, alongside London Assembly member Sian Berry