Pt. XII (ss. 271-347) modified (7.8.1991) by S.I. 1991/1773, art. 8, Sch.2.

Pt. XII (ss. 271-347) applied (1.12.1991) by Water Industry Act 1991 (c. 56), ss. 115(8), 223(2) (with ss. 82(3), 117(5), 186(1), 219(3), 222(1), Sch. 13 paras. 1, 2, Sch. 14 para. 6).

Pt. XII (ss. 271-347) applied (with modifications)(E.W.)(27.8.1993) by 1993 c. 11, ss. 24(1)-(3), (with s. 66(1), Sch. 3 para. 2)

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

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

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

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

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

Pt. XII modified (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. XII 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. XII 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))

Pt. XII extended and amended (Greater London) by London Government Act 1963 (c. 33), Sch. 11 Pt. I para. 24; amended by Health and Safety at Work etc. Act 1974 (c 37), s. 76(1)

Functions of the Minister of Housing and Local Government under Pt. XII in relation to or in consequence of ss. 25, 37, 38, 43, 53-55, 59(1), 60 (so far as it relates to proposed buildings), 61-67, 69-71, 137 now exercisable by Secretary of State: S.I. 1964/263, art. 2(2), Sch. Pt. II and 1970/1681, art. 2(1)

Functions of the Minister of Housing and Local Government under Pt. XII in relation to s. 59(2)–(4) or s. 60 (so far as it relates to buildings other than proposed buildings) now exercisable by Secretary of State: S.I. 1964/263, art. 3

References to local authorities and their districts in Pt.XII so far as it relates to ss. 15-24, 27-31, 33-36, 42 to be construed respectively as references to water authorities and their areas: Water Act 1973 (c. 37), s. 14(2)

Pt. XII (ss. 271–347) extended by Highways Act 1980 (c. 66, SIF 59), s. 166(4)

Pt. XII amended by Housing and Building Control Act 1984 (c. 29, SIF 61), s. 60(1)

Power to apply conferred (E.W.) by Housing Act 1988 (c. 50, SIF 61), s. 68(1)(c)

Pt. XII modified by Water Act 1989 (c. 15, SIF 130), s. 69, Sch. 8 paras. 3(7), 4(6) (with ss. 58(7), 101(1), 141(6), 160(1)(2)(4), 163, 189(4)–(10), 190, 193(1), Sch. 26 paras. 3(1)(2), 13(2)(3), 17, 40(4), 57(6), 58)

Pt. XII (ss. 271-347) modified (1.10.1992) by S.I. 1991/2913, art. 8, Sch.2.