From May to Heath: Tories who have faced votes on their leadership

Boris Johnson is not the first leader to face poll of party MPs, a situation that has often led to their downfall

• Boris Johnson to face no-confidence vote - follow live

Confirmation that Boris Johnson will face a vote of no confidence came on Monday morning, but he is not the first Conservative leader to have faced one, or a leadership contest. Here is a roundup of the former party leaders who have faced no-confidence votes or leadership challenges, as well as the outcome.