No change for RPI calculation

Old index maintained.

The ONS has decided to keep the inflation measure Retail Prices Index (RPI) intact. Photograph: Getty Images

The Office for National Statistics (ONS) has decided to keep the inflation measure Retail Prices Index (RPI) intact, despite its own consultation recommending a new index.

Instead, a new additional index of inflation will be published alongside RPI form March 2013.

However, the RPI will continue to be used for the updating of private sector pensions and index-linked bonds.

Any change to the method by which RPI is calculated would have had implications for numerous services and investments, including rail fares, water and particularly pensions.

The UK's national statistician, Jil Matheson, earlier concluded that the method to produce RPI was “flawed” and did not meet international standards.

"There is significant value to users in maintaining the continuity of the existing RPI's long time series without major change, so that it may continue to be used for long-term indexation and for index-linked gilts and bonds,” she said.

The three-month consultation was prompted by the need to address the gap between the estimates produced by the RPI and the Consumer Prices Index (CPI).

While pensioners will welcome the decision, a change would have aided chancellor George Osborne in his deficit reduction plan as estimates suggest it could have saved the Treasury up to £3bn a year in government bonds.

The main difference will be that the new index will use the same formula as the CPI for calculating average prices, meaning it will rise more slowly than the established version.

This story originally appeared on economia.