Just a few links to some 'critiques' of PFI / PPP projects.
I'm not generally a Guardian reader, but they have a nice collection here
You should look out especially for a chap by the name of George Monbiot, who seems to have done a lot of research on the topic and has managed to resist being converted to it's charms.
Even the Daily Telegraph, who you might think would normally be champions of the captains of Industry getting to fleece us got around to thinking they might just be taking the piss somewhat on this.
It's little wonder that the SNP tried to find an alternative to this. I can see the difficulty though. Once the financiers have managed to get their grubby fingers into the till, how could we expect them to be a wee bit less greedy? Of course they're going to resist efforts to fund projects which don't result in them earning their vulgar fees.