BORIS Johnson has insisted he would be prepared to borrow to finance "great infrastructure projects" as Tory leadership rival Jeremy Hunt claimed he would deliver Brexit sooner.

The former Foreign Secretary pledged to use "headroom" to allow him to invest in multiple projects at the same time as cutting taxes if he succeeds Theresa May, stressing he is "prepared to borrow" but "keep fiscal responsibility".

He also outlined a pledge to increase the number of special educational needs free schools south of the border as part of his £4.6 billion school funding plan, with questions raised about how he would fund this alongside extra police and broadband development.

On proroguing Parliament to push through Brexit, Mr Johnson said he did not want to do it nor expected to yet kept the option on the table.

He also claimed his words had been "totally taken out of context" when it came to reports he said "f*** business" when asked about business concerns last year.

The contests's frontrunner cited the same defence when questioned about previous remarks in which he referred to black people with "watermelon smiles", to which he replied "in a wholly satirical way", and women in burkas who "look like letterboxes".

In his own leadership pitch, Mr Hunt suggested he would be prepared to pursue "with a heavy heart" a no-deal Brexit despite the risks to business and said some of his spending pledges would be delayed as a result; although he would push on with a cut to corporation tax.

The Cabinet minister sought to maintain a tough sounding approach to Brexit, including a warning he could refuse to pay part of Britain's £39bn exit bill to the EU if negotiations fail, while repeating that he believed he could secure a deal.

Mr Johnson, appearing on Sky News' Sophy Ridge on Sunday, said of his spending plans: "There is headroom of about £22-25bn at the moment."

Asked if he was prepared to see borrowing increase, he added: "If it's borrowing to finance great infrastructure projects and there is an opportunity to borrow at low rates and do things for the long-term benefit of the country then we should do them."

The former London Mayor also said: "I'm prepared to borrow to finance certain great objectives but overall we will keep fiscal responsibility and keep going with the general trajectory of ensuring that this country pays its way and lives within its means."

On temporarily suspending Parliament to push through Brexit, Mr Johnson said: "I don't like the idea of proroguing, I'm not remotely attracted to it but MPs have to understand their responsibility to get this thing done and that was by far the best solution.

"I don't want to prorogue Parliament nor do I expect to, I don't think that's going to be necessary, and I think that it's far more important that MPs focus on where we are because politics has changed since March 29 and people can see than unless we get Brexit done there is going to be a continuing haemorrhage of trust and of confidence in my party and Labour as well."

Mr Hunt, appearing on BBC One's Andrew Marr Show, said it was a "fake debate" when asked if the UK would definitely leave the EU this year.

The Conservative leadership hopeful said: "If we got to the end of October and we've got a deal and we're trying to get it through Parliament but we need a few more parliamentary days, I'm not going to rip up that deal; Boris is.

"At the beginning of October if there is no prospect of a deal that can get through Parliament then I will leave at the end of October because that is our democratic promise to the British people."

Pressed further on the date of the UK's departure from the EU, Mr Hunt said: "We'll leave sooner with me than with Boris or anyone else because I am the person most likely to negotiate a deal and that is the quickest way to leave.

"What you're saying is something that's a dilemma. Parliament is trying to stop a no-deal Brexit, they succeeded before, they may succeed again; that is an issue that will face any prime minister, whatever they've said about October 31."

Earlier, the Foreign Secretary conceded some of his spending commitments "would have to wait" if there was a no-deal Brexit as money would be diverted to support businesses, adding: "I wouldn't drop them because we can make a success of no-deal...They would take longer because you wouldn't have that money at your fingertips straight away."

He added: "Of those commitments, the one I would not drop is the one to reduce corporation tax. It's not the tax cut people are talking about on the doorstep when you meet them but it is one that would fire up the economy in a way that would be helpful in a no-deal context because we would have economic bumpiness and we need to support businesses."

Mr Hunt, questioned if he would look people in the eye and tell them they should be prepared to lose their job as he would pursue a no-deal Brexit, replied: "I'd do so but I'd do it with a heavy heart precisely because of the risks."

Meanwhile, the Secretary of State also said he wanted an "international" team to negotiate the UK's trade deal post-Brexit with discussions taking place with Stephen Harper, the former Prime Minister of Canada.

Mr Harper, writing on Twitter, said he would be "willing to assist whoever serves as the next leader of the UK Conservative Party on trade matters, should they wish".