She is received by the queen.
Liz Truss is about to be appointed British Prime Minister and enter Downing Street on Tuesday to replace Boris Johnson.
At the end of the morning, the outgoing head of government arrived at Balmoral Castle, the summer residence of Elizabeth II, to officially present his resignation.
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Boris Johnson quits Downing Street and pledges 'fervent' support for Liz Truss
The 96-year-old sovereign received Liz Truss a few moments later to ask her to form a government, in a particularly difficult period for the United Kingdom, faced with a historic economic and social crisis.
She will become the Queen's 15th Prime Minister.
The handover is taking place at Balmoral, not at Buckingham Palace in London as is traditional, due to the Queen's mobility issues.
She intends to "take care of people's energy bills"
"It's over, friends": in a brief speech in front of Downing Street in the early morning, the outgoing leader praised his own record in front of a crowd of supporters and collaborators.
He compared himself to a "rocket having accomplished its mission" and re-entering the atmosphere.
“I will offer this government my most fervent support,” he assured.
Read alsoLiz Truss succeeds Boris Johnson: an iron lady side, ambitious and politically clever
Elected by 57% of the Conservative party's roughly 142,000 voting members, against 43% for rival Rishi Sunak, former finance minister Liz Truss, 47, until now foreign minister, is due to return to London to address the British in the afternoon.
She promised on Monday to govern "like a Conservative", to put in place "a bold plan to cut taxes and grow our economy" and to beat Labor in the legislative elections scheduled for early 2025.
Under pressure to help millions of Britons facing skyrocketing energy bills, she said she wants to tackle "the energy crisis by (dealing) with people's energy bills, but also by (dealing with) long-term energy supply difficulties”.
Third female Prime Minister after Margaret Thatcher (1979-1990) and Theresa May (2016-2019), the announcement of her government on Tuesday will be a first test for Mrs. Truss, who campaigned very right.