But she said she was "totally confident" that the crew did everything to keep the castsafe - no allegations of abuse have been made relating to Mr Owen's time with HTV.
"It's a thorny issue on both sides, especially since the U.K. has cast doubt on whether Berezovsky would receive a fair trial over there and indeed be safe, " said Global Insight's Augur, adding that it is unlikely that Lugovoi will be extradited.