I emailed my current MP (& cabinet minister) some time ago now suggesting we should also be looking to demonstrate our sovereignty and independence by applying to join the BRICS list. I haven't heard from him yet but I'm sure he'll get back to me once cabinet has made the decision.
Yeah, hell will be under 3 foot of ice before they are even aware what BRICS stands for - let alone considers joining them.
All you can do is live as independent of their system as you can.....or use their own financial system against them.