" The Bank of England distributes the nation’s money regionally in this way to avoid the danger of a single calamitous incident at one building destroying its stock of bank notes. This is important because, despite cheques and plastic, the public still uses a vast amount of cash. Approximately £37 billion is fluttering around the national economy daily in paper money. "

― Howard Sounes , Heist: The True Story Of The World's Biggest Cash Robbery