Part II Validity and Date of Operation of Orders to which this Schedule applies 4Paragraph 4 5Paragraph 5 6Paragraph 6 7Paragraph 7 8Paragraph 8 Notes on Schedule 3 Modifications C1 Sch. 3 extended by Post Office Act 1969 (c. 48), Sch. 4 para. 93(1)(xxvii) and Civil Aviation Act 1971 (c. 75), Sch. 5 para. 5(x) Part II