Penny Mordaunt announced her bid to become the next leader of Britain's Conservative Party to replace outgoing Prime Minister Liz Truss.

Mordaunt, 49, has navigated the tenures of the four prime ministers she's served under, keeping her distance from Boris Johnson's scandal-ridden time in power and staying in the cabinet under Theresa May to make her support for Brexit felt.

This is the second time she is running for the top job, after just missing out on the final two in the contest to become the leader of the ruling Conservative Party earlier this year. That race saw Truss defeat former finance minister Rishi Sunak.

"I’m running to be the leader of the Conservative Party and your Prime Minister - to unite our country, deliver our pledges and win the next GE (General Election)," Mourdant said on Twitter.

"I’ve been encouraged by support from colleagues who want a fresh start, a united party and leadership in the national interest."

Bookmakers place Mordaunt third, behind Sunak and Johnson, who are also expected to enter the race to succeed Truss.

Under Truss, she was appointed leader of the House of Commons, a role which also by chance gave her a higher profile job as 'Lord President of the Privy Council' - meaning she presided over the formal announcement of Queen Elizabeth's death and the proclamation of the new King Charles.

Largely unknown outside Westminster prior to taking an early opinion poll lead among Conservative Party members earlier this year, some of the public may have first seen Mordaunt on the reality TV show Splash! in 2014, where celebrities learned to dive. She performed a belly flop.

She joined May’s cabinet in 2017 as international development minister but a stint as defense secretary lasted just 85 days, when she was sacked by Johnson, reportedly for backing his rival Jeremy Hunt in the leadership campaign.

Johnson eventually brought Mordaunt back into government in February 2020.

As the leader of the House of Commons, a role charged with setting out the government business, her no-nonsense attitude gained her admirers.