Russian whistleblower's death in Surrey 'must be reinvestigated', friends say in wake of Navalny frog poison assassination

The death of a Russian whistleblower needs to be reopened following new evidence in the Navalny frog poison death, say friends piling pressure on British authorities.

Alexander Perepilichny, a businessman who investigated organised crime and corruption in Russia, died after collapsing on a job near his home in Weybridge, Surrey, in 2012.