Honestly, I think the Gvt are rather damned if they do and damned if they don't at this stage (and I am not a supporter - I loathe them).
It is also worth remembering that China only went public on the virus on 31st December last year - at that time the claim was there were "dozens" of cases. There seems to be some evidence that the situation had actually been going on for longer, and more people were affected, than the government was admitting to... but for the sake of simplicity lets take them at their word.At that time they had "dozens" of cases - shall we say 60? So a similar number to the number we had midweek (51 on 3rd March).
The Chinese Govt didn't introduce their quarantine of Wuhan until 23rd January - by which time at least 17 people are known to have died of the virus. We have not reached that stage yet - and if we follow a similar trajectory we won't until the end of this month. So it is unfair to say our Govt are obviously treating this lightly. It could well be that they are waiting for things to reach a certain point before the take action - there is a balance between acting too soon and causing unnecessary economic hardship for millions, and acting too late and letting the virus run rampant. I think they are carefully trying to balance this by waiting to introduce measures when they will be most effective (and, incidentally, have more public support than the would currently, when most of the country can't see what the fuss is about).
I can easily imagine that the Gvt may well close schools for Easter a week early - this would limit economic impact by only having one week where there is a surprise school closure (presumably parents have planned for Easter anyway) whilst providing a 3 week gap where children are not at school. What happens after the holidays I suppose then depends on what happens with the virus and case numbers.