Boo, hiss
You cannot take away someone's pension after you have employed them, your pension is part of your pay. It is not a bonus, it is not a nice to have, people need to know that they will get what they have paid for when they retire. This is regardless of it being a contributory scheme or not, you still pay for it because it's part of your remuneration package.
I wonder if the execs are in their own scheme?


