The problem with basing easing restrictions on a falling death rate is of courrse, how do you know how many people died of coronavirus as opposed to those who died with coronavirus (ie they tested positive for the virus but it didn't cause their death).
Bearing in mind that, on a typical day, 1500 people die in the UK, would it be fair to assume that once deaths of coronavirus drop to less than 300 a day, then restrictions can start to be lifted?
Whatever happens, I think if it gets to 7 May and Boris announces the lockdown will be extended again then people will increasingly start to ignore it.
Since the lockdown started on the 23rd March, there has been much ambiguity over the accuracy of the death rate. For example, I lost a distant relative to the disease on Easter Monday and his death would probably not have been added to a daily figure until maybe the Friday (April 17th) or even the following week. Tuesday's figures are generally a little higher than Monday's because weekend deaths are not collated straight away. The issue seems to be care home deaths and the way they have been recorded & the fact the figures for care home deaths are kept separately from hospital deaths.
It has been widely criticised that some deaths are being recorded as Covid19 when they are not. Back in March there was the tragic case of the young lady from Beaconsfield who apparently died of Covid19 but then the press & media had to do a major U-turn when it was established she had actually died of something else. There seems to be a trend with people jumping on the Covid19 bandwagon and marking causes of death incorrectly. One of the interesting things that has never been made public is comparisons with NON-Covid19 deaths. For example, thousands of people die each year in the UK from road traffic collisions, thousands die from Cancer, thousands die from...I think I've made my point!!!
My own prediction for 7th May is that Boris Johnson will have to raise the bar and offer some reward to people (such as the social bubble) because like you said people (not just the scum of society) will start to get restless and complacent with the lockdown. For example, the local B&Q in the town I live was brought to a complete standstill at the weekend when they opened their doors. Technically speaking, people should not be shopping for DIY or gardening stuff as we were only advised to shop for essential items. (such as food & medicines).
CJ