18:00Six O'Clock News19/03/2018 Boris Johnson says Russia has been stockpiling the nerve agent used in the Salisbury attackBBC Radio 4 Duration: 15 minutes Sun 18th Mar 2018, 18:00 on BBC Radio 4 LWAvailable for over a yearListen nowBoris Johnson says Britain has evidence that Russia has been stockpiling the nerve agent used in the Salisbury attack.GenresNewsFormatsBulletinsBrandSix O'Clock News Source: BBC Online