Former KGB double agent Oleg Gordievsky dies in Surrey aged 86

Soviet spy defected to Britain from Moscow under threat of exposure after supplying information to MI6 and MI5

• Oleg Gordievsky obituary

Oleg Gordievsky, the UK's most significant cold war double agent inside the KGB, has died at his home in Surrey aged 86.

Gordievsky, who would eventually defect to Britain from Moscow under threat of exposure, was considered a key agent operating for the UK's intelligence services working within the Soviet Union.