The vote is eligible to all Conservative MPs who take the whip. 2 MPs have had the whip removed pending investigations, one Andrew Griffiths MP who was accused of sexually harassing women and sending over 2000 harassing text messages. Another, Charlie Elphicke, who was suspended months ago for alleged sexual offences against two female staff. Of course these are both innocent until proven guilty but been accused of serious offences and the whip had been removed from both while they try to clear their names. While the whip is removed they're independent MPs and not Tories and not eligible to vote in party matters like this.
Today both have been given the whip back and have pledged to back May. Meaning they're now Tory MPs again and not independents and so eligible to vote.
That's absolutely disgusting. Innocent until proven guilty of course, but then that was true before the whip was removed. The decision was made that the allegations were serious enough to remove the whip, to restore it just so they can vote today makes me ashamed.