"The polonium trail started on 16 October 2006 when Litvinenko met Lugovoi and Kovtun in London. ..." "When Lugovoi and Kovtun's movements were mapped against the sites of polonium contamination, there was an exact match. The evidence of guilt was strong. In May 2007, the then Director of Public Prosecutions Ken Macdonald announced that Andrei Lugovoi was to be charged with murder and his extradition would be sought from Russia. Kovtun was charged in 2010. ..." Prof Norman Dombey, a physicist who has a deep knowledge of Russian nuclear sites, gave evidence at the public inquiry. Dombey says there is...