It was Putin!
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British Airways said they had been advised the risk to public health is low.
Passengers from the following flights are being asked to come forward:
• BA875 Moscow-Heathrow on October 25 - aircraft number GBNWX
• BA872 Heathrow-Moscow on October 28 - aircraft number GBNWX
• BA873 Moscow-Heathrow on October 31 - aircraft number GBNWB
• BA874 Heathrow-Moscow on November 3 - aircraft number GBZHA
The flights would have each been carrying up to 200 passengers.
It very possible other airlines should be checked as well.