When you take your pension, your pension fund will compare the career average pension you built up in the remedy period with the pension you would have built up in the final salary scheme. If the final salary pension is higher, the difference is added to your pension.
The underpin check will take into account the differences in the scheme structures. The Normal Pension Age for pension built up in the final salary and career average schemes is different for most members. The underpin check will also reflect any age adjustment to your pension because you are taking it early or late.
Visit the What happens if? page for more information on how the underpin works for different members.