Pt. III (ss. 57-74) extended (E.W.) by Electricity Act 1989 (c. 29, SIF 44:1), s. 112(1)(3), Sch. 16 para. 1(1)(xxvii), Sch. 17 paras. 33, 35(1)

Pt. III (except ss. 70(2)(3)(5), 71(1)): certain functions transferred (7.8.1991) by S.I. 1991/1773, art. 8(1)(3), Sch. 2

Pt. III (except ss. 70(2)(3)(5), 71(1)) modified (7.8.1991) by S.I. 1991/1773, art. 8(2)(3), Sch. 2

Pt. III (except ss. 70(2)(3)(5), 71(1)): certain functions transferred (10.1.1992) by S.I. 1991/2913, art. 8(1)(3), Sch. 2

Pt. III (except ss. 70(2)(3)(5), 71(1)) modified (10.1.1992) by S.I. 1991/2913, art. 8(2)(3), Sch. 2

Pt. III modified in part (6.4.2010) by The Cornwall Port Health Authority Order 2010 (S.I. 2010/1215), arts. 1(1), 4, Sch. (with art. 2)

Pt. III modified in part (E.) (6.4.2010) by The Bristol Port Health Authority Order 2010 (S.I. 2010/1214), arts. 1, 4, Sch.

Pt. III modified in part (6.4.2010) by The Cowes Port Health Authority Order 2010 (S.I. 2010/1216), arts. 1(1), 4, Sch.

Pt. III modified in part (6.4.2010) by The Southampton Port Health Authority Order 2010 (S.I. 2010/1218), arts. 1(1), 4, Sch.

Pt. III modified in part (6.4.2010) by The Portsmouth Port Health Authority Order 2010 (S.I. 2010/1217), arts. 1(1), 4, Sch.

Pt. III applied (with modifications) (E.) (24.3.2011) by The Hull and Goole Port Health Authority Order 2011 (S.I. 2011/939), arts. 1(1), 9, Sch. 2

Pt. III functions transferred and modified (E.) (14.6.2016) by The River Tees Port Health Authority Order 2016 (S.I. 2016/644), arts. 1(1), 9, Sch. 2

Pt. III functions transferred and modified (E.) (31.3.2017) by The Weymouth Port Health Authority Order 2017 (S.I. 2017/558), arts. 1(1), 9, Sch. 2 (with art. 9(3))