Our pension as it stands is supposed to have an Act of Parliament protecting it, that isn't stopping management at the moment
That's the point. The pension scheme itself cannot be changed, apart from the Act of parliament, so contributions into the pension have to be changed. Some might say it's semantics. However, others might say that as soon as we, the workforce, voted in non-pensionables such as AAVAs, we already opened the door to non-pensionable salary.