Up and down the UK, Private Finance Initiatives (PFI) are destroying public services. Introduced by John Major's government and expanded by New Labour, the PFI policy was designed to use private financing to build and run public sector infrastructure projects. PFI consortia consist of bankers, construction companies and facilities management firms. The projects work like a mortgage, with repayments on the work completed made over decades. There is just one snag: the interest rates for PFI agreements are scandalously high.

The NHS has more than 100 PFI hospitals. The original cost of these 100 institutions was around £11.5bn. In the end, they will cost the public purse nearly £80bn. The total UK PFI debt is over £300bn for projects worth only £55bn. This means that nearly £250bn will be spent swelling the coffers of PFI groups.

Jeremy Hunt on Junior Doctors

Just imagine what could buy for that in a time of supposed austerity. My rough calculations suggest it would cover the salaries for all the nurses, all the consultants and all the GPs needed to serve the NHS for 10 years – and you would still have billions left over to train the next generation or two of surgeons, build 80 state of the art hospitals, and treat tens of thousands of cancer patients for a year.

To put it more simply: it would cover the entire NHS budget for approximately two and a half years.

We are constantly told that there is no money left; that we cannot afford the NHS as it is currently run, or to fund high quality public services. Yet there is plenty of money for the banks and for PFI. And the UK PFI debt is four times the size of the budget deficit used to justify austerity. In other words, austerity is a political choice rather than a necessity.

Innisfree, a small finance company based in the City of London, is one of the biggest players in the PFI market. One of Innisfree's flagship projects is the largest NHS PFI scheme at St Bartholomew's and the Royal London hospitals in London. This could have been publicly financed for around £1bn; instead, it will end up costing £7bn by the time repayments are complete in 2049. The difference of £6bn will go to PFI consortium Skanska Innisfree and partners. To put these figures into a more digestible format, Barts is paying over £2m a week in interest, which adds up to over £120m a year, before they see a single patient.

In pictures: Junior doctors first all-out strike Show all 10 1 /10 In pictures: Junior doctors first all-out strike In pictures: Junior doctors first all-out strike Doctor in acute medicine, Melissa Haskins, holds up a 'I ain't afraid of no Hunt' sign whilst striking with other junior doctors outside her hospital, St Thomas' Hospital in London Getty Images In pictures: Junior doctors first all-out strike Accident and emergency junior doctor, Jennifer Hulse, holds a homemade placard outside St Thomas' Hospital as she strikes with colleagues in London Getty Images In pictures: Junior doctors first all-out strike Demonstrators and Junior doctors hold placards as they protest outside the Basingstoke and North Hampshire Hospital, in Basingstoke during a strike by junior doctors Getty Images In pictures: Junior doctors first all-out strike Demonstrators and Junior doctors hold placards as they protest outside the Basingstoke and North Hampshire Hospital, in Basingstoke during a strike by junior doctors Getty Images In pictures: Junior doctors first all-out strike A supporter displays a slogan on her bag during a junior doctors' strike outside St Thomas' Hospital in London Reuters In pictures: Junior doctors first all-out strike The picket line outside King's College Hospital in London PA In pictures: Junior doctors first all-out strike The picket line outside King's College Hospital in London, as thousands of junior doctors begun the first all-out strike in the history of the NHS after the Health Secretary said the Government would not be "blackmailed" into dropping its manifesto pledge for a seven-day health service PA In pictures: Junior doctors first all-out strike Junior doctors and supporters take part in a strike outside the Royal United Hospital in Bath Getty Images In pictures: Junior doctors first all-out strike Doctor in acute medicine, Melissa Haskins, holds up a 'I ain't afraid of no Hunt' sign whilst striking with other junior doctors outside her hospital, St Thomas' Hospital in London Getty Images In pictures: Junior doctors first all-out strike Dave Prentis, UNISON general secretary visits a British Medical Association picket line at Royal Sussex County Hospital in Brighton, to show support for striking junior doctors on the second day of the union's annual health conference PA

Innisfree chief executive David Metter was paid £8.6m in 2010. It's no surprise that a majority of NHS hospitals are now in deficit with PFI as a major factor. And you thought your mortgage was bad. Just imagine if they could spend that money on patient care.

The majority shareholder in Innisfree is Coutts, the Queen's bank. Coutts UK, in turn, is owned by RBS. RBS thus effectively has a controlling stake in hospitals, boosting its profits whilst simultaneously running public services into the ground.

It is worth recalling that the combined bail-out and losses of RBS since the crash amount to £95 billion. This is almost equivalent to the NHS budget for a whole year, yet it is still extracting profit out of the NHS.

HSBC also has a controlling stake in many PFI schemes, and even owns PFI hospitals outright. HSBC was caught red-handed laundering money for Mexican drug cartels, organisations linked to Al-Qaeda, Russian gangsters and sanctions busting. Yet HSBC is also profiting from the dismantling of healthcare.

The Treasury building upgrade is a PFI scheme, and HMRC is renting offices from a company registered in an offshore tax haven thanks to a PFI scheme. You really couldn't make this stuff up. In fact, public-private partnerships have even been exported globally including to Iraq and Libya. PFI has been such a roaring success that George Osborne is rolling out PFI2, the blockbuster sequel.

Some smaller hospitals have already been able to buy their way out of PFI, and there are multiple precedents for taking services back into public hands when the private sector fails. So it’s time for the PFI debt to be cancelled and the introduction of a future policy of financing public infrastructure directly.

NHS Solidarity – supported by doctors, nurses, teachers, Disabled People Against Cuts (DPAC) and several unions – has called a demonstration and peaceful sit-down protest at St Bartholomew's hospital on Thursday, moving later to the City of London. NHS Solidarity is calling for the renationalisation of the NHS. The legislation to enable this, the NHS Reinstatement Bill, is being heard by Parliament today. This is a last chance to give our health service a fresh start.