Not to do with Birmingham. and one would have thought obvious to anyone, even me, with a small knowledge of computers. I do use Excel and am not good with it, but I am not an expert. This is apparently true and been reported on several sites as to the recent "excess" numbers of covid cases
grahamcluley.com
The conclusion is, if you use computers read the manual!! Particularly if you are charging several million pounds to the public purse

UK loses 16,000 COVID-19 cases due to Excel spreadsheet snafu
Some 16,000 Coronavirus cases in the UK went missing after the Excel spreadsheet they were being recorded in reached its maximum limit, and did not allow the automated process to add any more names.

The conclusion is, if you use computers read the manual!! Particularly if you are charging several million pounds to the public purse