That's not what I said. however you make a valid point and its something that has contributed to the spread of Covid in the UK and the number of deaths. London is a travel hub, and the UK is quite densely populated. Apparently, there were 1300 separate cases of Covid entering the UK (according to genetic studies) so its hard to see how it could have been contained. Closing the borders may have helped, but hindsight is wonderful - back in March daily deaths were so low that closing the borders would have seemed outrageous. If only we knew then what we know now.