It’s my opinion that flights to and from China should be stopped, in my opinion that should happen immediately. That at the very least is what should be done, in fact I thought it should have been done last week when some other countries did it.
It’s more tricky about other countries, certainly I know at least one person came here via Singapore, it was the so called SuperSpreader, who has now recovered, but infected about eight other people. The first two cases in Britain came straight from China Suzie, they booked into a hotel up north, the north east I think, and now another person has been diagnosed and she came from China.
The taking of temperatures is more controversial because as missfoodlove says, anyone determined to avoid being put into quarantine could simply take some paracetamol.