F1S. 18(2) substituted (S.) (1.4.2005) by Salmon and Freshwater Fisheries (Consolidation) (Scotland) Act 2003 (asp 15), s. 71(2), sch. 4 para. 1 (with s. 71(3)(4)(6)); S.S.I. 2005/174, art. 2

F2S. 18(3) inserted (15.11.2006) by The Scotland Act 1998 (River Tweed) Order 2006 (S.I. 2006/2913), art. 1(2), Sch. 4 para. 1

F3S. 21 repealed by Industrial Expansion Act 1968 (c. 32), Sch. 4