Changes made by Radioactive Substances (Substances of Low Activity) Exemption 1992
S.I. 1992/647
Made to Radioactive Substances (Substances of Low Activity) Exemption 1986
2 changes. All changes made by Radioactive Substances (Substances of Low Activity) Exemption 1992
From legislation.gov.uk's record of changes, the official one: see it there.