I’m not privy to the exact thinking of ministers, but the general thrust of it seems sound. There is no way to really prevent the virus spreading across the UK so the task is really to delay it
But the obvious thing to have done was a couple of weeks ago tell everyone returning from northern Italy to self isolate. They didn't listen and now its shrug of shoulders oh well its here now.
Not to mention if they had made everyone returning to self isolate, that would have significantly delayed the peak.
I originally thought the government had a good grip on this, but after letting 100s 1000s? of potential cases just carry on as normal made me start doubting them, nothing they have done or said since has persuaded otherwise.
and yes I did watch the Chris whitty questions, and I really don't have the time and inclination now to rewatch it to pull it apart for you. But no I was not reassured by him in the slightest.