When you start taking your pension, you may have the option to convert all of it into a one-off cash payment, depending on the size of your pension. You can find out more here.
Whatever the size of your pension, you can usually choose to swap some of it for tax-free cash when you start taking your pension.
If you are more than a year under your Normal Pension Age (usually 65), you can swap your future benefits in the Scheme for a one-off sum of money that is transferred into a different pension arrangement. See Transferring out.