Inflation: Changes to the calculation of RPI expected
10 January 2013 Last updated at 06:53 GMT
Changes to the measurement of inflation are set to be announced, potentially cutting the income of many private sector pensioners.
The Office for National Statistics has been consulting since October on three possible changes to the way the retail prices index (RPI) is calculated.
Any of the changes would ensure that RPI rose more slowly in the future.
Ben Geoghegan reports.