It follows a grueling six-week campaign that has seen the two leadership contenders take part in a dozen Conservative pursuits across the UK’s four nations. Who will be the next prime minister? Watch and watch live from 12.30 on Monday as Boris Johnson’s successor is announced But when will we know who will succeed Boris Johnson, what processes follow the outcome and what else can we expect from what is sure to be a very busy week at Westminster? Politics hub: Liz Truss to ‘act now’ on energy crisis – live updates Monday: The next Tory leader and Prime Minister has been announced At around 12.30pm on Monday, the returning officer for the Conservative leadership election – the chairman of the 1922 committee of MPs, Sir Graham Brady – will announce the result of the contest. Here we will find out if Mr. Sunak or Ms. Truss won. Sir Graham is also expected to give details of the number of votes from Tory members. It is expected that the winner can then say a few words. Tuesday: Boris Johnson and the new leader will meet the Queen On Tuesday, both Boris Johnson and the new Conservative Party leader will travel to Balmoral to meet the Queen for the official handover. The Queen will formally appoint the next Prime Minister shortly after Mr Johnson’s meeting. Usually a new prime minister is invited to Buckingham Palace to be appointed by the Queen, but in a break from tradition this year, Her Majesty is staying in Scotland. Downing Street speech The new Prime Minister will then travel back from Balmoral to London before making his first Downing Street speech as Prime Minister. It is believed Mr Johnson could make a farewell speech outside Number 10 on Tuesday morning before traveling to Balmoral to see the Queen. Cabinet appointments From Tuesday afternoon into the evening, it is expected that the new leader will begin to name their top government team. This will include roles such as Foreign Secretary, Chancellor, Home Secretary and Business Secretary. The new prime minister is also likely to receive phone calls from other world leaders congratulating them on their appointment. They can also make their first calls to their foreign counterparts. Ms Truss said her first correspondence would be with Ukrainian President Volodymyr Zelensky. Wednesday: First Cabinet meeting It is thought the new prime minister could hold his first cabinet meeting having named their top team. The main topic of discussion is likely to be the ongoing cost of living crisis, with the country’s next leader under increasing pressure to step in to ease the burden of spiraling energy costs as quickly as possible. The first PMQs At midday, the new prime minister will take part in the first session of Prime Minister’s Questions in the House of Commons – coming face to face with Labor leader Sir Keir Starmer. Boris Johnson could be watching from the Conservative backbenches alongside his predecessor Theresa May. More ministerial appointments For the rest of Wednesday afternoon, it is expected that the new prime minister will continue to make ministerial appointments until all roles in government departments are filled. It is also likely that the prime minister will have more phone calls with his foreign counterparts.