I think I see what's getting folks all riled up about final salary pensions...
I'm sorry to say, that the pension you get is not the same as your final salary, merely based on it.
As stands in the LGPS , for every year you work and contribute to the pension scheme you get 1/60th (1/80th for years before 2008) of your final salary as pension.
So, to get that 50% of final salary that kipya refers to, to cover just the basics, you'd have to have worked between 30-40 years.