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Don't listen to this. Yes, you might be likely to get it, we all might. That point is absolutely not "you’re going to get it sooner or later [so may as well get it sooner]".
If you do get it now from your trip to London, whatever you feel the odds are, and you take it back to from wherever you came from, how would you feel if that was then passed on to someone more vulnerable or more people than it needed to be passed on to? If you can just not take the trip to London and add to the prevention of adding immediate/acute burden to health/support services, then don't do it.
Odds are you’re going to get it sooner or later. At least you get a day of peace and tranquility in the deserted streets of London before everything gets closed.