Further down, maybe the article has been updated PHE had set up an automatic process to pull this data together into Excel templates so that it could then be u

Further down, maybe the article has been updated PHE had set up an automatic process to pull this data together into Excel templates so that it could then be uploaded to a central system and made available to the NHS Test and Trace team as well as other government computer dashboards. The problem is that the PHE developers picked an old file format to do this - known as XLS. As a consequence, each template could handle only about 65,000 rows of data rather than the one million-plus rows that Excel is actually capable of.