Part CLASSES OF PLANT AND MACHINERY TO BE ASSUMED TO BE PART OF THE HEREDITAMENT Changes not yet applied. Later legislation changes this provision in ways not yet written into the text below: Sch. Class 5 words substituted by Electricity Act 1989 (Consequential Modifications of Subordinate Legislation) 1990 Sch. CLASS 1AChapter CLASS 1A CLASS 1BChapter CLASS 1B Part