What is the real public debt figure?

Don't ask Gordon Brown, he won't tell you the whole truth. Instead take a read of Policy Exchange's "Public Sector Pensions - The UK's second national debt". Here's the summary, you may want to sit down before reading this:

"A new report from Policy Exchange today reveals the true extent of the public sector pension debt, which until now has been kept hidden and out of official figures. The cost of these schemes is much larger even the publicly acknowledged national debt.

Taken into account with net public sector debt, this second national debt brings the total the Government owes to £1.854 trillion, or 150 per cent of GDP."

Anyone fancy raising this with Gordon Brown? If you do, I predict the answer will involve the following phrases: "Choice between Tory cuts and Labour investment", "lowest national debt in Europe", "democratic renewal", "choice between Labour investment and Tory cuts", "tax cuts for the 3,000 richest families in Britain"...