Notlangley:
you can find the final report here:
http://cdn.hm-treasury.gov.uk/hutton_final_100311.pdf (specifically page 22 onwards).
This issue is currently being discussed on Newsnight. Jeremy Paxman made the same point that I made above. As a percentage of GDP, the cost of providing public sector pensions is set to decrease even without pension reform. The government appear to be using economic arguments to justify what is essentially a political decision.
From what I can gather, public sector pensions shifted from RPI to the lower CPI rate of inflation a few years ago, which reduced the overall cost of the scheme.