OK, that's news to me - although it still says Serco (and therefore presumably whatever companies Serco is subcontracting) are running some of the actual facilities and tracing operations.
Rumors spread on Monday morning that the UK National Health Service’s Test and Trace team, an outsourced service created in May to track and help prevent COVID-19 in the country, bungled their reported figures due to an easily avoided Excel mishap. The story was later confirmed by the BBC.
Team members used an old Microsoft Excel file format known as XLS to track tens of thousands of COVID-19 cases in the country.
The XLS file format — which was created over 30 years ago and was superseded in 2007 — can only handle about 65,000 rows of data. Other formats are capable of well over a million.
That means 15,841 confirmed COVID-19 cases were unaccounted for between September 25 and October 2, according to the BBC. That’s about eight days of incomplete data.