I didn't.
When I came here at age 50 the state pension was a distant thought. Knowing that my state pension would be frozen would not have changed my decision. It is an unfair situation and as laudable as all these Change petitions are, they are p1ssing in the wind - no government has the incentive to change it.
As Maya Angelou said "If you don't like something, change it. If you can't change it, change your attitude."