Gilts are propped up
He's funding spending by selling debt (i.e. selling gilts), the Bank of England is buying the debt with QE money. i.e. it's printing money to buy Government debt because nobody else wants to buy it.
That inflates the price people will pay for gilts and makes others even less likely to buy them at the inflated price. So the Bank of England has to buy more of them to take up even more of the slack. The gilts back the £ currency, so the BoE then has to prevent the collapse of the gilt price.
So TUC is living in f***ing dream land, pardon my asterisks', UK is in for some serious pain once his QE inevitably becomes unsustainable, and if the TUC don't think there needs to be cuts, they are in a fantasy world.
To blame Lehmans for this is to confuse cause and effect. Cause was a flood of money from Bush/Cheney repeated fiscal stimulus packages and borrowing from the Fed (which also increased moneys supply), Paulsons' stimulus package was just the latest of these unfunded spending sprees.
Bernanke is hiding junk in the fed balance sheet, and refuses to let Congress see the books, how long before those assets true value comes out and Bernanke is no longer hailed as the 'savior' of the US, but it's destroyer?
Tough times ahead for the UK and US and secondary shocks for everyone else.