I had my only personal UK bank account frozen without warning for weeks. The first I knew of it was when the call centre wouldnt answer the phone for 45mins from the shop where I had just tried to use the card. Had to abandon the process and go home. Next morning, call the bank call centre, do security get told they cant talk to me. The processes to get the account activated was interesting, I couldnt complain to the govt ombudsman until I had exhausted the complaints process with the bank. Problem was the bank wouldnt talk to me, every time I called the call centre, passed security checks they would tell me they couldnt talk to me, so you are kept in a legal limbo of sorts. Govt ombudsman couldnt do anything until the 1st stage had been completed. So the rules are exploitable as most lawyers will also demonstrate in court.

So yes have some cash but behind the scenes data sharing does go on, it could be a simple conversation down the pub or a contract to process some data or provide a service.

Signwritten vans & trucks give the game away to neighbours as to whats going on.

Get some crypto where you can draw cash out of a machine, there are plenty of bitcoin machines and online crypto currency exchanges to move money around the world. When the Greek govt debt crisis kicked off, bitcoins spiked as people moved their money out of Greece, some events like this will also trigger a spike in crypto because its less bulky remembering a string than shipping tonnes of gold across borders.

The less reliant you become on any one entity the less any one entity can mess you up especially when you dont agree with their politics, methods or employer.