Henry,
I have my own thoughts about the change to CPI - we are all in different circumstances. As a youngish 'pensioner', I grudgingly accept that as we are in a financial maelstrom together, I have 20 years or so to address any potential shortcomings in my own financial future.
The g'ment also changed much else to do with pension legislation that doesn't get as many column inches. For instance, the link between the state pension and earnings, scrapped by Maggie in 1980, will be restored. The annual increase will be protected by a (so called) 'triple lock' - the annual rise will be in line with earnings, prices or a 2.5% increase (whichever is the greater).