With service between those dates, you're a section B member with all your benefits having a normal retirement age(NRA) of 60.
If you want to take your pension before NRA you will face a 5% per year reduction on both the lump sum and the pension. So if you were to take it in the near future at 57.5 years old for example, that would mean a 12.5% hit.
If you take the lump sum, you also have to start drawing the pension.
Your quote will give you different options, where you might be able to take a higher lump sum & a lower pension, or vice versa.
Pensions are classed as earned income in the same way as wages are, so it may be liable for income tax, depending what your other income is.
NIC's are not payable on pension income.
The lump sum is tax free.
You'll have to contact Capita who haven't been particularly good at processing the pensions of some people, as you may have seen on this site. But they do seem to be getting their acts together.
For further reading, look at the RMPP website
and the RMSPS website