Covid19 goes beyond politics just what I said, GillT57 and way beyond one person who just happens to be the current PM. This crisis goes way beyond one person who just happens to be PM, way beyond one party which happens to be in power. Let's judge the two latter, PM and party, by the way in which they pull us out if it.
Actually, although Boris didn't call for an early enough lockdown, he did still follow the scientific advice when it advised following a plan for herd immunity. I felt he had reason to delay lockdown for as long as possible because the British public weren't going to take it for more than a few months, as has been demonstrated.