Gone are the days when TSB was Britain’s most recommended high street bank, named that in 2016, or when it was rated the best high street bank for service by Which?, a brand name used by the Consumers’ Association, dubbed so in February of last year. In the biggest IT migration disaster since the RBS shut out customers for over a week in 2012, the bank’s customers are facing an 11th day of disrupted or non-existent service either online or via mobile apps.