Let’s say you have 100,000 pounds sterling in the bank. This is not THAT much, equal to about 121,000 US dollars.
Furthermore, say the government wants to force everyone to use the digital pound.
What would happen to your “excess” 80K pounds sterling?
Of course you will be offered a time interval to trade it in.
Often that, owning it will be punishable by imprisonment or death.
Unless, of course, your are an “Inner Party Member”.