'TSB gave me access to someone's £35,000'

This appears to be an IT failure comparable to the 2012 and 2015 IT failures at the Royal Bank of Scotland. These involved multi-day / multi-week full/partial outages, and multi-million pound fines.

FT: https://www.ft.com/content/9178ef60-46d9-11e8-8ee8-cae73aab7...

Background: TSB is a UK bank. They had a planned 50-hour maintenance window over the weekend (Fri 16:00 - Sun 18:00), to move away from Lloyds's systems (following the "un-merger" in 2013-2014). This went wrong, in what is likely to become a textbook example of an IT failure.

It must be asked, has any bank ever made changes to their IT systems and got it right first time?

It just seems like whenever they even glance at their business-critical systems, they wind up in a truly bizarre state like this.