I think that any difference between the rules that MPs set for themselves, and those they set for the rest of us, is significant, no matter that 1 is a work pension, and the other is the state pension. Don't you, Annie?

Many people have advantageous occupational pensions while others don't. If MPs set more generous terms for themselves for their pension than for others - and at taxpayers' expense - then that is of concern. However if the rules for state pension are universal then, so what? It's apples and pears

Not quite, since, as you say, many people rely on the state pension, having no work based pension to boost their income. I can't see why rules on advance notification required for changes to pensions should be different.