Prudential Regulation Authority Rulebook

19.1

A firm must make, and retain for an appropriate period, a record of:

1. (1) the methods and assumptions used in establishing its mathematical reserves, including the margins for adverse deviation, and the reasons for their use; and
2. (2) the nature of, reasons for, and effect of, any change in approach, including the amount by which the change in approach increases or decreases its mathematical reserves.