Over the last few years, it has been reported that HSBC (and other banks apparently) have been suddenly withdrawing banking facilities due to 'safeguarding' issues, known or unknown. E.g. if someone from Russia bought some of the shares 15 years ago, even though they have had nothing to do with the company since. Or for no known reason.
How does a small UK-based business that banks with HSBC ensure that it can continue trading when Safeguarding comes knocking? I.e Which banks could it approach as a backup, to ensure that the business, the employees, the customers and suppliers are not 'safeguarded' into bankcruptcy?