CK, the OP has clarified the question but to square the circle, I was talking only of pensions and tax thereon and NOT tax relief on pension contributions.
I certainly had my age relief last year pared back as I received more than the £27,500 limit. This year the age relief for my age group has been abolished.
The ways of HRMC are a mystery to all, including themselves. This year they have applied all my tax coding to one of my pensions which is less than the permitted relief. My other pensions and jobs are all taxed at 20%.