Tory MP and wife used taxpayer-backed Help to Buy loan to snap up new constituency house
The scheme is intended to help struggling Brits climb the property ladder.
The scheme aims to help people who would struggle to find money for a deposit or don't have enough income to get a full mortgage to buy new-build homes.
Under the scheme, house-buyers only need to front up 5% of the purchase price in deposit.
The Government will lend up to 20% of the cost of the home, and the loan is interest free for the first five years.
There is no suggestion of any wrongdoing on the part of Mr or Mrs Bone.
But Labour MP John Mann said: "Help to Buy is meant to be for young people seeking a first home , not for ageing Members of Parliament.
"The Prime Minister will not be amused."
According to documents seen by the Mirror, the house was purchased under Mrs Bone's name last January, with £35,000 of the purchase price borrowed from the Government.
The website of the developer of the home prominently advertises Help to Buy mortgages being available for the properties on their websites.
The website of the Brexit-backing Grassroots Out campaign, of which Mr Bone is a director, is registered to the house, a three-bedroom mid-terrace in Wellingborough.
And AJWB Travel, a company owned by Mr and Mrs Bone, has been registered there since last January.
The Wellingborough MP denied both owning the property and having a Help to Buy mortgage, and said the Grassroots Out campaign does not operate from the house in question.
But he would not deny that he lived in the property as his constituency home, saying: "We are advised as Members of Parliament not to reveal where we live, for security reasons."
Mr Bone listed the property as his constituency home address on official documents ahead of the 2015 General Election.
He added: "As Mrs Bone is a private citizen, I do not comment upon her financial arrangements."
We approached Mrs Bone for comment, but she had not responded at the time of publication.
Help to Buy equity mortgages are available to anyone buying a new-build home worth less than £600,000.
There is no age or income limit for applicants, but the new home must be their only residential property.
Mr Bone has been publicly supportive of Help to Buy, telling Sky News in 2013 the scheme was "excellent."
He said: "The Prime Minister is absolutely right, we need to get people to be able to buy their own houses, we need to get the housing market going and unfortunately the media tends to be London-centric, sees these booming housing prices in London which is not reflected in Wellingborough.
"My goodness me, you would be amazed what you could buy for in Wellingborough but people are struggling to get the deposit.
But shortly after the scheme's launch in 2013, experts warned it was "very dangerous."
Graeme Leach, former Chief Economist at the Institute of Directors, has attacked the scheme, saying it would “drive up prices”.
And former Bank of England governor Mervyn King warned the Chancellor against introducing the scheme, which could see the Government underwrite up to £130bn of mortgage lending.
He said: "We do not want what the US has, which is a government-guaranteed mortgage market, and they are desperately trying to find a way out of that position."
"We mustn't let this scheme turn into a permanent scheme."