However, what is being talked about is the likelihood that this may have been around for longer. My DP, our friend, DP's boss, my sister, all came down with a chest infection and fever over Christmas. It took ages to shift and the symptoms are similar.
If it had been around for ages, then we could safely conclude that China was over-reacting and it was anything to worry about, due to the surprising lack of floods of people needing ventilators.
Pick your poison, but the descriptions of the worst case scenarios of how bad this virus is are incompatible with it having been in the UK since December. Either it's not that bad, or it's not here.