TSB fined £49m over IT system meltdown
SB has been fined nearly £49m for an IT meltdown in 2018 that caused chaos and left its customers unable to access online accounts for several weeks.
UK's financial regulator said the failings were "widespread and serious" and led to "significant disruption".
roblems began in April 2018 when an attempt to move data to a new computer system went wrong.
All areas of TSB's services were affected, including branch, telephone and online banking.
roblems were not fully resolved for eight months and "a significant proportion of its 5.2 million customers were affected by the initial issues", the Financial Conduct Authority (FCA) said.
It led to the departure of the bank's then chief executive Paul Pester.
Mark Steward, executive director of enforcement and market oversight at the FCA, said: "The failings in this case were widespread and serious which had a real impact on the day-to-day lives of a significant proportion of TSB's customers, including those who were vulnerable."
FCA said TSB had paid £32.7m in compensation to customers who were affected by the problems.
SB chief executive Robin Bulloch said: "We'd like to apologise again to TSB customers who were impacted by issues following the technology migration in 2018. We worked hard to put things right for customers then and have since transformed our business."
roblems were triggered when TSB tried to move 1.3 billion customer records from an old system run by its former parent bank, Lloyds, to one managed by its current Spanish owner, Sabadell.
However, it proved disastrous with many customers being locked out of their accounts and some customers being given access to the confidential records of others.
Cases included people trying to complete house purchases and unsure whether they could move in. The BBC spoke to one couple who sat with a loaded removal van outside their new home waiting for funds to be released.
Another couple who were locked out of their wedding savings were forced to grovel to their DJ and wedding car provider because they were unable to pay them as the big day approached.
Businesses were also left in difficulty. Lee MacDonald, who played Zammo in children's TV show Grange Hill in the 1980s, told BBC Radio 5 live that he was "having an absolute nightmare" in his locksmith business.
Shortly after the issues emerged, Mr Pester admitted to the BBC that the bank was "on our knees".
roblems continued for many weeks and TSB came under fierce criticism for the IT failings. Mr Pester was directly, and unusually, criticised by MPs for the saga. 
FCA said while data itself was transferred successfully, the IT platform "immediately experienced technical failures".
"This resulted in significant disruption to the continuity of TSB's banking services, including branch, telephone, online and mobile banking," it said.
Mr Steward added: "The firm failed to plan for the IT migration properly, the governance of the project was insufficiently robust and the firm failed to take reasonable care to organise and control its affairs responsibly and effectively, with adequate risk management systems."
SB was fined a total of £48.65m - made up of a £29.75m penalty from the FCA and a fine of £18.9m from the Prudential Regulation Authority (PRA).
"The disruption to continuity of service experienced by TSB during its IT migration fell below the standard we expect banks to meet," said Sam Woods, the PRA's chief executive.
In February 2019, TSB said that the disastrous IT upgrade had cost it £330m, and about 80,000 customers had switched their account away from the bank in 2018.
mplexity of the switchover and the problems it caused has meant a long investigation and eventual fine by the regulator. In the meantime, there has been significant reputational damage for the bank.