Changes to Forestry (Exceptions from Restriction of Felling) 1979
S.I. 1979/792
Made by Electricity Act 1989 (Consequential Modifications of Subordinate Legislation) 1990
1 change. All changes to Forestry (Exceptions from Restriction of Felling) 1979
From legislation.gov.uk's record of changes, the official one: see it there.