https://www.tsb.co.uk/news-releases/slaughter-and-may/slaugh... - the report itself
Interesting notes from the summary:
* Functional testing took 17 months, and began very late due to project delays.
* The board was told that there were only 800 bugs, and yet the independent review found that there were more like 2000
* Non-functional testing seems to be rushed
* the Sabadell COO reported SABIS, one of its child companies and major IT contractor in the migration doesn't have the capacity to respond and solve incidents after go-live
And the TSB board decided to Go Live anyway.
Looks like a classic IT failure story - project is late, save costs on operations, get tired of testing and fixing and decide that it is good enough to be released. But also some very weird incentives - SABIS was apparently not the best vendor for the job, but they are a part of Sabadell, the bank that bough TSB.
Looking at the "Integrated Master Plan" Gantt chart of the project on page 44 is Waterfall as hell and they still failed to plan for Non-functional testing.
These some first impressions, it looks like a interesting read.