The first Labour MP to be deselected is Diana Johnson.
She's just won back bencher of the year, and from what can gather is strong campaigner for women's issue's aswell as campaigning for for her constituents. Constituents who voted her back in.
www.hulldailymail.co.uk/news/hull-east-yorkshire-news/breaking-diana-johnson-labour-deselection-3295016
www.politicshome.com/news/uk/political-parties/labour-party/news/106362/diana-johnson-becomes-first-labour-mp-face
So momentum want her out, but why her? why right now?
In the Hull daily mail link, they hint at that she may now be allowed to put herself forward for reseletion. Yet other new links say it's automatic that she would be put forward.