I would recommend interested HNers to read up on the State Pension Triple Lock; and the various income tax cliff edges as some key examples.
With respect to the income tax, it is possible for higher earning (not by US standards) employees to receive a bonus and actually take home less money than before they received the bonus.
The triple lock is a politically motivated policy which always grows the state pension (given to essentially all UK citizens and anybody that ever worked there for more than 3 years) at a rate faster than earnings grow or faster than the economy grows. It will subsume the entire government budget.
Given the extremely high cost of energy, and housing in many places, younger people also seem to be opting out entirely. Disability payments the government pays are increasing at a rapid rate. (1 in 13 of the population are currently receiving this benefit).