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He was jailed in January at Liverpool Crown Court for three counts of murder, 10 counts of attempted murder, and other offences including producing ricin, possessing terrorist material, and possessing a knife.

Police officers discovered ricin pulp and a copy of an al-Qaeda manual at Rudakubana's house, but did not find any clear ideological reason for his attack, so did not classify it as terrorism.

Three days later, the lab confirmed that the suspicious substance was the poison ricin, but the public was not told.

She believes it came into contact with the ricin.

Tests at Porton Down, the government's biological warfare laboratory, confirmed the substance was ricin, a poison for which there is no cure.