Lord Hutton of Furness is first and foremost a politician
Paragraph 2.14 of Page 44 of Anasis’s second reference actually says
If CPI uprating were to be continued through the 21st century, with an average differential from RPI of 0.75 percentage points as forecast, then subject to how cap and share is operated, this change could reduce public service pension expenditure by over 10 per cent by 2030 (£5 billion in 2008-09 prices) and by 20 per cent by 2060.
But that Interim report was published in 2010.
When will the final report be published?
Staying with the Interim Report I see that on page 140 in table C.1 the forecasts for 2010/2011 are 2.8% increase for CPI and 4.2% for RPI. This should be compared with actual figures - 5.2% for CPI and 5.6% for RPI Reference -__link
This forecast for 2010/2011 was evidently a bit wide of the mark.