Changes to Plant Breeders' Rights (Miscellaneous Ornamental Plants) 1990
S.I. 1990/1594
Made by Plant Breeders' Rights (Miscellaneous Ornamental Plants) (Variation) 1992
1 change. All changes to Plant Breeders' Rights (Miscellaneous Ornamental Plants) 1990
From legislation.gov.uk's record of changes, the official one: see it there.