How would you record it Mike?
28 days brings England into line with the other countries of the UK and it is certainly far better than the old system where nobody was ever assumed to recover. The infection fatality rate would have eventually been 100%, which I hope you agree is ridiculous. The death toll would have continued going up and up even when nobody was getting Covid anymore. Apparently, 88% of Covid deaths occur within 28 days of the first positive swab so the figures are not going to be massively out.
https://www.bmj.com/content/370/bmj.m3220
We also have the ONS weekly measure, which is based on what is stated on the death certificate. This includes where Covid is suspected even if no test has been done.