It looks like the Brits may be working with a short list of suspects:
Passengers have been asked to come forward after radiation traces were found on two BA planes linked to the death of former Russian spy Alexander Litvinenko.
The BA 767 planes operate on routes within Europe and up to 800 passengers on four flights may have been affected.
A statement from the airline said: “BA has been advised that three of its Boeing 767 short haul aircraft have been identified by the UK Government as part of the investigation into the death of Alexander Litvinenko.
The flights involved are surely making Putin and friends a little nervous:
• 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