The amounts you have already accrued should be safe in the pension.
In 2015 most of the public sector pensions moved from final salary to career average, and from then on, the accrual rates changed, as well as the date that you could claim your undress ex pension changing to state retirement age (for anything earned after that point). It is possible that the government will introduce further changes as time passes, but what you have already accrued should be safe on the basis of the current terms.
Incidentally, the government has recently lost a case called McCloud in the Supreme Court, where public sector unions sued the government for age discrimination over the 2015 changes which imago ted younger workers worse than older workers who remained on the old final salary pension. It has already been decided that workers in the relevant public sector pensions who were already in then in 2012 (when the changes were passed in law ready for 2015) and are still in now, will be able to choose to have their pension for the period 2015-22 under the old final salary terms or new career average terms. Most workers will be better off having the extra 7 years of final salary as it all accrues based on the final year of earnings or best 3 of final 10 years average. Plus, importantly, many of those workers will then be able to get that extra 7 years of retirement funding at 60 rather than waiting to 67 or 68. It is worth tens of thousands to many of the public sector workers in their 40s and 50s. Each individual worker will need to choose if to have 2015-22 in career average or final salary, and the government is currently deciding if individuals should choose now or at retirement. From 2022 the career average terms (still very good) will apply to all.
It doesn't take long to get up on pensions. There is lots of info on defined benefit pension sites devoted to the individual pensions and most have online dashboards to track your own pension. For Defined Contribution pensions, there is lots online suggesting figures a single person or couple need for a basic, adequate and comfortable retirement and how much someone should be putting into their scheme. Just a couple of hours if googling would make anyone much more informed very quickly.
And also lots of public sectors have links to financial advisers too through the unions. They can be helpful for getting a fuller understanding of what you've accrued and are on track for.