Put simply( for my own mind lol) there are millions of journeys undertaken every day in London, the underground(perfect spreader)? Overground, buses,cabs, offices, pubs and so on, but where is it? Is it already here as BB alludes to, is it similar to having a heavy cold, not very nice, but also not particularly deadly?
Western levels of health care obviously help, but no deaths in London, population 8 million and over several weeks..hmm.