Labour MP Heidi Alexander is quitting Parliament to work for London Mayor Sadiq Khan, it was confirmed today.
Ms Alexander's departure will trigger a by-election in Lewisham East and will be seen as another blow to Labour leader Jeremy Corbyn.
The MP has clashed repeatedly with Mr Corbyn and joined a walk out on his shadow cabinet in 2016. She has since been a leader in opposing Brexit from the Labour backbench.
