Mind you, I seem to recall that daily cases still continued to increase for the first 2-3 weeks of the first lockdown, so obviously correlates with a couple of weeks' time lag between the initial onset of people just becoming infected (pre-lockdown) and officially testing positive a couple of weeks later. It wasn't until at least mid-way through April that overall daily cases in the UK really started to decline, so we probably won't be seeing any early results until probably at least the end of next week.

Also, first time round, community testing didn't really start properly until towards the end of May, which was probably one of the reasons why cases didn't start to come down as quickly back then, plus that was probably the main reason why there were a lot of undercounted cases at that time.