Thanks for reply.
In my case there are 4 elements of which only 1 is getting 8.5 percent.
The other 3 at 6.7 percent my letter gives only the new weekly amount so I have asked them to detail why I have been paying for spurious benefits that are not treated as a full pension.
Incidentally I am in my middle 80s so many changes have happened to NI eg SERPS etc and for some of that time I was paying maximum monthly payments.
I had the phone call because my math's of what 8.5 percent increase was did not agree with their letter. The call centre agreed with my math's then told me to expect an explanation by phone wirhin 4 weeks.
I have asked for a detailed letter to allow me to understand their reasoning.
My advice is check the math's, they got it right last year but are short changing some of us this year.