Hi Pontious,
I think if you look on your statement of your last yearly pension payments from the Gov, somewhere after the amount it gives the % of the lifetime allowance. Now, I think that refers to your "pension pot" (theoretical for public pension) at the time you received your pension. However, I know that there are/were reserved rights on this and the allowable lifetime allowance has been changing fast but, I don't understand the detail of that, sorry!
OAP