What could 1922 Committee elections mean for Boris Johnson?

Elections seen by many as proxy ballot on whether prime minister should face second no-confidence vote

One of the most important but understated elections in Westminster will take place within weeks, with the date still shrouded in secrecy but candidates already plotting their campaigns.

With positions on the 1922 Committee of Tory backbenchers, which sets rules for the parliamentary party, up for grabs, this is how the contest works and how it could influence whether Boris Johnson will face another no-confidence vote.