PFi was introduced by the Tories in 1992 under John Major but didn't really take off in the NHS until teh Labour Govet came in to power.
From an article here:
"The use of PFI was very limited until 1997 but became widespread under the New Labour government.[11]
Two months after New Labour took office, the Health Secretary, Alan Milburn, announced that "when there is a limited amount of public-sector capital available, as there is, it's PFI or bust".[10] PFI expanded considerably in 1996 and then expanded much further under New Labour with the NHS (Private Finance) Act 1997,[12] resulting in criticism from many trade unions, elements of the New Labour Party, the Scottish National Party (SNP), and the Green Party,[13] as well as commentators such as George Monbiot. Proponents of the PFI include the World Bank, IMF and (in the UK) the CBI.[14]"