My dad just got his first taxable pension letter

I spent my morning explaining to my retired dad why he suddenly owes HMRC money despite his pay rise last month. With the State Pension hitting £230+ a week and the Personal Allowance still stuck at £12,570, he’s officially been dragged into the tax net by a measly few hundred quid. I noticed that the 4.8% increase basically goes straight back to the Treasury for anyone with even a tiny bit of savings interest. It’s the ultimate stealth tax, HMRC doesn't have to raise rates if they just wait for inflation to do the work for them. I’m not sure how many pensioners are actually aware they’re now taxpayers until that P60 arrives.