Boris Johnson has vowed he will push for introducing an immigration system modelled on a so-called Australian-style points system, resurrecting one of the key promises of the Vote Leave campaign.

In a pledge that could pave the way to abandoning the Conservatives’ net migration target, Johnson said the country needed to be more open to highly skilled immigrants and tougher on those who “abused” the UK’s “hospitality”.

Johnson’s camp stressed this proposal was not intended to suggest he would abandon the current proposed immigration bill, but would instead give new instructions to the migration advisory committee (MAC) to investigate the idea of a points-based system.

The MAC will be asked to consider how people can be admitted to the UK on the basis of specific criteria, including by examining the Australian points system.

Q&A How does an Australian 'points style' immigration system work? Show Hide Aside from temporary work visas, such as the one-year version used by many young Britons and others to work in lower-skilled jobs such as agriculture and hospitality, Australia has a strictly capped limit for permanent migration of 160,000. Of these spaces, about a third are intended for those moving for family or humanitarian reasons, with the rest based on skilled migration. There are two types of permanent visa – people who are sponsored by a specific employer, and those who apply independently. Both routes require the applicant to accrue 65 points to move. Points comes from a range of factors, among them: Age: These range from 25 points for those aged 18-24, to zero if you are over 50.

These range from 25 points for those aged 18-24, to zero if you are over 50. English language skills: People receive 20 points for 'superior' skills, ten for proficient, and none for 'competent'.

People receive 20 points for 'superior' skills, ten for proficient, and none for 'competent'. Work experience: More time in a particular occupation brings more points, with experience in Australia counting more than that from overseas.

More time in a particular occupation brings more points, with experience in Australia counting more than that from overseas. Qualifications: Again, higher qualifications bring more points, up to 20 for a doctorate.

Again, higher qualifications bring more points, up to 20 for a doctorate. Relevant skills: Gaining entry requires your jobs to be on the so-called skilled occupation list, a lengthy collection of jobs with shortages, and various classes of visa for which such a job allows people to apply. Some critics of the Australian system argue it is a blunt tool, and that the strict points-based criteria can mask other skills and qualities. The cap can also cover a significant backlog in processing people. However the idea of introducing a similar system in the UK post-Brexit has been repeatedly floated by prominent Leave supporters like Boris Johnson and Nigel Farage. Peter Walker, political correspondent

“We will restore democratic control of immigration policy after we leave the EU,” Johnson said. “We must be much more open to high-skilled immigration, such as scientists, but we must also assure the public that as we leave the EU we have control over the number of unskilled immigrants coming into the country.

“We must be tougher on those who abuse our hospitality. Other countries such as Australia have great systems and we should learn from them.”

The UK already has a points-based system for non-EEA migrants, introduced by the Labour government in 2008, where eligibility is determined by a set of mandatory criteria to which a fixed number of symbolic points are attached.

A Commons library paper on the system, published in 2018, said: “Calls for the UK to adopt a system closer to the ‘Australian model’ have persisted, although it has not always been obvious what advocates specifically have in mind.”

Johnson also pledged he would ensure EU nationals’ rights were entrenched and said he regretted that that had not happened straight after the 2016 referendum. “I will sort it out immediately and make sure that this issue is properly dealt with, and millions of people can stop worrying,” he said.

The government has already introduced a new immigration bill, which ends freedom of movement for EU nationals, though it does not specify the shape of the immigration system from 2021.

A government consultation has started on the system but the home secretary, Sajid Javid, has already ordered a review of Theresa May’s proposed £30,000 salary threshold for immigrants to qualify for work visas, asking the MAC to look again at the plans.

Profile Boris Johnson's Tory leadership campaign Show Hide Personal style A late-night altercation between Tory leadership favourite, Boris Johnson, and his partner, Carrie Symonds initially changed the dynamics of Johnson's campaign. He had been either invisible or deliberately sober to the point of dullness, when his usual primary draw to Tory members is a self-created sense of optimism and fun. Much is also made of his supposed broad appeal to the electorate, evidenced by two terms as London mayor. His bizarre claim to make model cardboard buses has raised eyebrows. In most political contests, Johnson’s character – he has lost more than one job for lying, and has a complex and opaque personal life – would be a big issue, but among the Tory faithful he seemingly receives a free pass. It remains to be seen what impact that late-night police visit will have on his chances. Brexit He has promised to push for a new deal while insisting the UK will leave the EU come what may on 31 October, even if it involves no deal. While his hard Brexit supporters are adamant this is a cast-iron guarantee of leaving on that date, elsewhere Johnson has been somewhat less definitive. Asked about the date in a BBC TV debate, Johnson said only that it was 'eminently feasible', although he then went on to tell TalkRadio that the 31 October deadline was 'do or die'. Taxation His main pledge has been to raise the threshold for the 40% higher tax rate from £50,000 to £80,000, at a cost of almost £10bn a year, which would help about 3 million higher earners, a demographic with a fairly sizeable crossover into Tory members. Johnson’s camp insist it would be part of a wider – and so far unknown – package of tax changes. Public spending He has said relatively little, beyond promising a fairly small increase in schools funding, as well as talking about the need to roll out fast broadband across the country. Johnson has generally hinted he would loosen the purse strings, but given his prior fondness for big-ticket projects – London’s cancelled garden bridge, the mooted 'Boris island' airport – perhaps expect more of a focus on infrastructure projects than services. Climate and environment This is unlikely to be a big issue for Conservative party members, and Johnson has not said much on this beyond confirming his general support for the new government target of cutting greenhouse gas emissions to a net zero by 2050. Foreign policy Also unlikely to be a big issue among Tory members, beyond vague platitudes on 'global Britain', it could be a weak spot for Johnson given his poor performance as foreign secretary. He was seen as something of a joke by diplomats – both UK and foreign – and is likely to face more questioning over his gaffe about the jailed British-Iranian woman Nazanin Zaghari-Ratcliffe Peter Walker Political correspondent Photograph: Isabel Infantes/AFP

Johnson said he would continue with the current immigration bill but also ask MAC to look at what elements of the Australian points-based system could be incorporated into the immigration systemto be introduced from 2021.

The Conservative leadership frontrunner was among several leading members of Vote Leave who floated the idea, during the referendum campaign, of an Australian-style system to replace free movement. Neither Johnson’s campaign nor Vote Leave promised that the system would reduce immigration.

Boris Johnson’s full English Brexit could rip the union apart | Martin Kettle Read more

Johnson’s leadership rival, Jeremy Hunt, also announced a new policy, pledging to waive tuition fee debt for young people starting new businesses that employ more than 10 people for five years.

Hunt, who has staked his leadership campaign on his background as an entrepreneur, said: “If we are to turbo-charge our economy and take advantage of Brexit we need to back the young entrepreneurs who take risks and create jobs.

“I want more young people to have the confidence to take the decision to start their own business so we create wealth and start thriving as a country again.”

His campaign said student entrepreneurs employing others would create far more benefit for the economy than the cost of tuition fees. Statistics from the Higher Education Statistics Agency suggest just 1% of students start their own businesses, although 5% are freelance or self employed.