Well, what I know is PFI/PPPs are currently strongly criticised in the UK see posts on my other diary Healthcare in France : following the UK example

I am not sure this is about having a private company involved in revamping a public infrastructure, but rather about the concern about misuse of public funds, the way the tender process is organised, etc.
But I'm sure Londonbear can contribute on this and help answer your question.

When through hell, just keep going. W. Churchill