The incident occurred due to a technical issue that allowed unauthorized access to a database containing the keys. The Bank of England has taken immediate steps to address the situation and has notified all affected customers. The exposed data includes customer names, account numbers, and transaction details. The Bank of England is working closely with law enforcement agencies to investigate the incident and prevent further unauthorized access. Customers are advised to remain vigilant and report any suspicious activity to their bank or the Bank of England. The Bank of England takes the security of customer data very seriously and is committed to protecting the privacy of its customers.