If I saw this presented on a stage…
I’d be going ‘Ah ha!’
The Foreign Secretary is telling all Brits abroad to come home ‘While they still can’.
The Prime Minister is telling us all to stay home and not come out.
If I were writing this as a scenario for one of my role-playing games I’d be seeing immense significance in the timing of that. Something sinister would be going on!
As it is this is just another outburst of random government activity.
I think.
Things are moving fairly fast at the moment. Only a couple of days back I was torturing myself (no one else is allowed to) about whether to go to the Eastercon or not. And now the Eastercon is cancelled along with 90%+ of other public events and we are only allowed to have necessary and vital shops.
Sheesh. I’m glad I bought a new set of speakers for my computer today. I wonder if the chemists will be regarded as important enough to stay open. Why do I have this feeling that the government hasn’t thought through the implications of all this?
Ah, right. Experience.
Asleep in Room3b 
You can do this competently, or you can flail around, waste weeks, and make sure that nobody trusts you even when your advice is good. (Because we know they’re the sort of people who will, for example, use a ban on public assembly to ban legitimate protests once the immediate danger is past.)