I have lost confidence in the Brexit policy of the Prime Minister and have therefore written to the Chairman of the 1922 Committee asking for a vote to take place over her Leadership.
Notes from Wikiquote
The prime minister, Theresa May survived her party's confidence vote on 12 December 2018, but resigned as Conservative Party leader on 7 June 2019. In this period, the Chairman of the 1922 Committee was Sir Graham Brady.