Andy Burnham will be denied the chance of a perfect start to his premiership after his likely No10 move-in date got pushed back after the World Cup final.The clear favourite to succeed Sir Keir Starmer, Mr Burnham is expected to be formally declared Labour leader at a special conference on July 17 - the day after nominations for the position close.But it is understood he would not become Prime Minister immediately, with the official handover scheduled for the next working day, which is July 20.This will push the former Mayor of Greater Manchester's coronation past the World Cup final in the US taking place the day before.Football-mad Mr Burnham will still hope to take advantage of an upswing in the nation's spirits should England triumph at the New York New Jersey stadium in just over three weeks' time, although this is looking increasingly unlikely in light of the side's recent goalless draw with Ghana.It was previously believed Mr Burnham would be confirmed as Labour leader on July 15 and as the new PM two days later but this has now been pushed back. Leadership hopefuls now have until July 16 to secure the support of 81 Labour MPs and three of the party's affiliated organisations to get onto the ballot.Mr Burnham is currently the only declared candidate for the party leadership, backed by several Cabinet ministers as well as backbench MPs. Football-mad Andy Burnham pictured holding a Radcliffe Football Club shirt on Friday after the club hosted Labour's launch of their campaign for Greater Manchester Mayor Mr Burnham's No10 move-in date has been pushed back after the World Cup final (pictured: England players celebrate scoring against Croatia last week)Wes Streeting, previously seen as his main rival, ruled himself out of the contest shortly after Sir Keir announced his resignation on Monday.Former armed forces minister Al Carns remains a possible challenger and has yet to rule himself out of the race, although he seems to be focused on gaining leverage for more military funding.Sir Keir insisted he wants to 'minimise disruption' and behave with 'good grace' following his resignation on Monday.The outgoing premier also pointedly claimed he was 'leaving the country in a better position than when I found it', after being effectively forced out by pressure from MPs. Sir Keir provoked laughter in the Commons on Wednesday when he insisted he was 'pleased' Mr Burnham won the Makerfield by-election - a victory that effectively ended his political career. Speaking on a visit to a cinema in Milton Keynes today, the PM said: 'I am stepping down after two years, leaving the country in a better position than when I found it.'I will do that with good grace, and I will do that making sure that there is an orderly transition, and that is what I am going to do.'I'm going to be professional, I'm going to have foremost in my mind a sense of service and duty that has driven me as Prime Minister.'I will continue to faithfully serve my country to make sure that any disruption is absolutely minimised, and that's why I'm taking steps now to ensure that can be done in a sensible way.'While Mr Burnham's journey to No10 is fast becoming a procession, it has emerged that more than half of Britons would back a new law to force political parties to hold a General Election if they change leader during a Parliamentary term, according to a new poll.The survey shows that 55 per cent of the British public would support a law that would mandate an immediate General Election if the governing party installs a new leader in Downing Street.Three quarters of Conservative voters and 83 per cent of Reform UK supporters would back such a change - while just 1 in 5 of the overall electorate would object to it.It comes after Nigel Farage called for the country to go to the polls 'at the soonest possible date' as he said that Mr Burnham would not have 'any kind of meaningful mandate' if he enters No 10. It means Sir Keir Starmer, pictured at No10 Downing Street on Thursday, will still technically be Prime Minister if/when England win the World CupThis sentiment has even been echoed by some in Government, with Home Office minister Mike Tapp calling for a change in the law to guarantee a general election if a PM is forced out early.The survey by Ipsos also paints a picture of a 'disillusioned British electorate', pollsters said, as the UK prepares for its seventh prime minister in ten years.Half of people now worry that the country is 'ungovernable', regardless of who is in power, according to the representative poll of 1,000 Britons conducted after Sir Keir announced his departure.Pollsters said the public mood around a new prime minister is characterised by 'apathy rather than optimism', with 38 per cent of people saying a new leader will make 'no difference' to the overall state of the country.More than half of people expect a new leader to have 'no personal impact on their life' and 56 per cent predict there will be little change to their local area.Pollsters said that these low expectations 'match the public appraisal' of Sir Keir's legacy, with 57 per cent of the public believing that he did a 'bad job' as Prime Minister.Mr Burnham, meanwhile, seems to be readying himself for No10 as he continues to mull potential Cabinet picks.Rachel Reeves appears to have conceded she will no longer be staying on as Chancellor despite making a thinly-veiled pitch for a big role earlier this week.Several senior ministers including Home Secretary Shabana Mahmood and Energy Secretary Ed Miliband are reportedly in the running to succeed Ms Reeves.An unlikely alliance of some trade unionists and city traders have reportedly urged Mr Burnham against appointing Mr Miliband as chancellor, because they believe his net zero policies to be damaging.But transport union the TSSA has thrown its weight behind Mr Miliband, saying: 'We believe Ed Miliband has demonstrated that he understands the need for a different approach, one that is prepared to invest for the long term and deliver an economy that works for everyone.'The self-proclaimed 'King of the North', Mr Burnham is thought to be pushing for a 'No10 in the North' - but security experts have sounded alarm over the idea.The idea has emerged as a symbol of the former Greater Manchester mayor's determination to decentralise power from Westminster.It has been compared to US President Donald Trump's fondness for splitting his time between his Mar-a-Lago estate in Florida and the White House in Washington DC.But Mr Burnham has been warned that creating a regular base in Manchester would be far from simple.Philip Grindell, a former detective who advised Parliament on security for MPs after the killing of Jo Cox, said the site would need to replicate the security arrangements in place for the real No10.Friday also saw Mr Burnham announce that he would donate 15 per cent of his MP's salary to causes in his Makerfield constituency, beginning with the social club that provided the headquarters for his by-election campaign.