Government scientists briefing MPs were clear this week that the effects of lockdown would not be visible in the data until this weekend @MrHarryCole

That is, cases may have flattened _since_ lockdown but any change is not yet _because of_ lockdown. Official. https://twitter.com/mrharrycole/status/1329699215128268800

Here is the official data: cases began to drop before the effects of lockdown appear in the data, which official advisers told MPs would be this weekend:

https://coronavirus.data.gov.uk/details/cases 

There is no excuse for a minister creating the impression this change was caused by lockdown.

Cases in Manchester, Liverpool, York, Newcastle upon Tyne.

This cannot have been caused by national lockdown.