A 20:1 capitalisation factor is what is used in the UK for valuing DB pensions under their equivalent of tne Standard Fund Threshold.
Adopting a single 20:1 and ignoring whether there is an attaching spouses pension or post retirement indexation or when the individual retires, is clearly unfair. When one looks at the number of senior civil servants who retired recently with pensions payable from mid-50's and with attaching spouses pensions and indexation, the market value capitalisation factor should have been closer to 35:1.
But guess who makes the rules?????