As London goes into Tier 4 COVID lockdown here is proof that the government data for London is flawed

With the sudden announcement of the Tier 4 lockdown for London yesterday I decided to look at the London hospital admissions and 'case' data (where, by definition, 'case' = positive test). Using the data at https://coronavirus.data.gov.uk and filtering on London I did a plot of hospital admissions as a percentage of cases (this is a crude measure of 'se…