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I believe they were bought by a European bank following their spinoff from Lloyds. This bank itself specialised in buying small banks, which it could consolidate onto its existing IT systems, saving tonnes of money along the way. TSBs accounts were significantly larger and more complex than what they migrated onto was able to handle, and there's evidently plenty of stuff they were unable to test sufficiently before it hit Prod:
Insider story here:
https://www.theguardian.com/business/2018/apr/28/warning-signs-for-tsbs-it-meltdown-were-clear-a-year-ago-insider
Is there a good summary somewhere of what the fuck is happening at TSB? I'm not a customer but some of the stories are nuts. How are they still able to trade?