TSB had a major IT meltdown when it tried to migrate to a different core banking system: https://www.independent.co.uk/news/business/news/tsb-it-failure-cost-co

TSB had a major IT meltdown when it tried to migrate to a different core banking system: https://www.independent.co.uk/news/business/news/tsb-it-failure-cost-compensation-customers-switch-current-account-a8757821.html https://www.independent.co.uk/news/business/news/tsb-it-fail...