Changes made by Pensions Increase (Local Authorities' etc. Pensions) 1983
S.I. 1983/1315
Made to Pensions Increase (Local Authorities' etc. Pensions) 1974
2 changes. All changes made by Pensions Increase (Local Authorities' etc. Pensions) 1983
From legislation.gov.uk's record of changes, the official one: see it there.