ANY PRIMARY SCHOOL CHILD COULD TELL YOU

...you need two numbers to calculate a percentage.

No overall infection number of any kind divided by a questionable number of deaths = a non-existent mortality rate.

We do not know the mortality rate of Covid-19 in the UK.

https://www.derrynow.com/news/news/536178/the-cure-may-be-much-worse-than-the-disease-says-a-derry-doctor-who-describes-aspects-of-the-ongoing-coronavirus-lockdown-as-non-evidence-based-insanity.html