There was a huge amount of publicity several years before and news discussions. I got no letters, but I can certainly remember newspaper articles and campaigns.
However, this was for the gradual rise from 60 to 65. I checked, as everyone over 55 is advised to do, and found a 2 year rise. So I am a little scathing about those who said they did not know.
Having said that, the 2nd change for those born after 6/4/53, was NOT well publicised at all and the more recent changes for both men and women are very confusing. Both have happened too late for those affected to do anything about it.
What is equally concerning is the slide in of the charging of NI to those still working over 60.
AND even more concerning is that fact that pension rises are %, so that women are more adversely affected, along with anyone retiring under the old rules (which basic pension is lower than the new one)
I am also concerned that we are moving away from a community minded attitude of a basic income for everyone, to a more selfish personal pension, where only those who have good enough jobs ALL through their working life will have enough to live on. I see a point at which the state pension will be so eroded as to be worthless and the future will see vast numbers of pensioners on charity handouts or even homeless like in the US