Got an email from HMRC that my Tax Code for next year was available.
Had to go online to see it, looks like they are not sending a paper copy out now.
Yes, State Pension showed an increase so Tax Code changed and increased tax due from my other pension!
Spent most of the last two years getting this corrected from earlier years of increase applied, eventually getting a cheque from HMRC.
Contacting them is not easy, the complaints page has gone.
Rang HMRC three days ago, after trying for 5 times, cut off after a few minutes, and then hanging on for 1 hour 10 minutes finally spoke to someone who corrected the error.
Checked online and my Tax Code returned to normal.
I suppose I'll have to do this again next year.