As much as I hate Boris, this is one of those situations where he shines. He's focused and appears to be leaning heavily on expert advice. I voted Labour, but I think Corbyn's ability to dither and insist on 500 meetings before making a decision would have represented a woeful response to a crisis.
If you want to see how it's not done, watch US news (not Fox though), Trump apparently held up the supply of testing kits because he wanted to keep "numbers low" so he could boast about how well he handled the crisis and boost his re-election chances. Not being the smartest, he forgot that you can't bully a virus on Twitter. It doesn't care what the Republican party will say about it. This could finish him off, he's like a rabbit trapped in the headlights.
One other thing, a Harvard scientist was on MSNBC this morning and mentioned that the virus can be transmitted in the aerosol around us. He described "aerosol" as the dust and moisture you see in the air indoors behind direct sunlight. That's not something that's been mentioned in the UK, yet. Plans are in place for the shutting down of UK cities next week if need be, that's according to my contact at the Foreign Office, many companies in the City of London are having (often global) mandatory home-working days today to test systems, deep clean offices and be prepared for the worst.
I think we may see reduced transport services next if Boris raises the threat level.