Jonathan Bryce wrote:

As some other replies have stated, we need some more numbers, but
generally speaking, the NHS pension is much better than what you would get
elsewhere.

Don't forget, though, that this is not a straight either-or comparison
between using some money (be it from savings or diverting it from current
earnings) to buy added years in the NHS pension, and investing the same
money in some other pension.

There are loads of other options, such as spening it now, or just keeping
it in savings (or adding it thereto).

Questions to ask oneself include:

How adequate is the existing unenhanced pension?
How much more valuable is it to boost it by buying extra years?
Might it be more valuable, once drawing a pension, to have more capital
than more income?