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I'm not posting this to support the paper, but:
It was confirmed by the Chinese government at the end of December. So it was spreading in December for certain - perhaps earlier. So it doesn't seem implausible that it could have got to London during this period. Getting to your point: Once it was announced by China to be a thing, and the Who got on board, it's possible that testing was directed at those who had direct links to recent travels. Resources directed towards potential positives, rather than wasted on almost certain negatives?
@dt
didn't all the early cases have direct links to recently traveling abroad? Surely if it had been here and spread around a while before the first recorded cases then they would appear to have no direct cause of infection?