Nope i dont think its needed yet.
This thing will grow, peak, plateau then decline.
Italy and spain are showing signs that they have already peaked, if we follow suit we shouldnt be far behind, in fact new cases last couple of days have been stable.
Theres no need to shut down the economy altogether unless this totally gets out of hand, which it hasnt as of yet, in a week or two we should start to see the effects of the lockdown.
The Gov have done the maths on this, if and when further action is needed im sure they will call it.
Maybe those who have decided to stop work are hoping for a full lockdown to make them feel better. How gutted will you be if in a few weeks this starts to subside and you could have worked for two months