Leslie was responsible for the escape of Ronald Biggs from Wandsworth Prison . Biggs was one of the gang responsible for the 2.6 million pound Great Train Robbery in 1963 . This case was the first time that DEA agents served as '' agent provocateurs '' for a country other than the United States . Subsequent to the arrest of Leslie , British authorities seized the 40 kilos of heroin
Great Train Robbery
Great Train Robbery (1963)
Louis Diaz