Modifications etc. (not altering text)
C1Pt. 4 (ss. 131-184) modified (20.6.2003) by 1988 c. 41, Sch. 7 para. 20(5)-(8) (as substituted by Enterprise Act 2002 (c. 40), ss. 185, 279, Sch. 11 para. 11(3); S.I. 2003/1397, art. 2(1), Sch. (with art. 8)
C2Pt. 4 (ss. 131-184) modified (20.6.2003) by S.I. 1996/275 (N.I. 2), art. 23(2A)(2B) (as substituted by Enterprise Act 2002 (c. 40), ss. 168(9), 279, Sch. 9 para. 22(2)); S.I. 2003/1397, art. 2(1), Sch.
C3Pt. 4 (ss. 131-184) modified (20.6.2003) by 1993 c. 43, s. 67(2A)(2B) (as substituted by Enterprise Act 2002 (c. 40), ss. 168(9), 279, Sch. 9 para. 21(2)); S.I. 2003/1397, art. 2(1), Sch.
C4Pt. 4 (ss. 131-184) modified (20.6.2003) by S.I. 1992/231 (N.I. 1), art. 46(2A)(2B) (as substituted by Enterprise Act 2002 (c. 40), ss. 168(9), 279, Sch. 9 para. 20(2)); S.I. 2003/1397, art. 2(1), Sch.
C5Pt. 4 (ss. 131-184) modified (20.6.2003) by 1991 c. 56, s. 31(4) (as substituted by Enterprise Act 2002 (c. 40), ss. 168(9), 279, Sch. 9 para. 19(3)); S.I. 2003/1397, art. 2(1), Sch.
C6Pt. 4 (ss. 131-184) modified (20.6.2003) by 1991 c. 56, s. 31(2A) (as substituted by Enterprise Act 2002 (c. 40), ss. 168(9), 279, Sch. 9 para. 19(2)); S.I. 2003/1397, art. 2(1), Sch.
C7Pt. 4 (ss. 131-184) modified (20.6.2003) by 1984 c. 12, s. 50(2B) (as substituted by Enterprise Act 2002 (c. 40), ss. 168(9), 279, Sch. 9 para. 16(2)); S.I. 2003/1397, art. 2(1), Sch.
C8Pt. 4 (ss. 131-184) modified (20.6.2003) by 1989 c. 29, s. 43(2B) (as substituted by Enterprise Act 2002 (c. 40), ss. 168(9), 279, Sch. 9 para. 18(2)); S.I. 2003/1397, art. 2(1), Sch.
Pt. 4 (ss. 131-184) modified (25.7.2003 for certain purposes and 29.12.2003 for certain purposes) by Communications Act 2003 (c. 21), ss. 370(3), 411(2)(3) (with transitional provisions in Sch. 18); S.I. 2003/1900, arts. 1(2), 2(1), 3(1), Sch. 1 (with arts. 3-6 (as amended (8.12.2003) by S.I. 2003/3142, art. 1(3))); S.I. 2003/3142, art. 3(2)
Pt. 4 (ss. 131-184) modified (N.I.) (1.4.2007) by The Water and Sewerage Services (Northern Ireland) Order 2006 (S.I. 2006/3336 (N.I. 21)), arts. 1(2)(3), 29(4) (with arts. 8(9), 121, 307); S.R. 2007/194, art. 2(2), Sch. 1 Pt. 2 (with Sch. 2)
In this Part, the expressions listed in the left-hand column have the meaning given by, or are to be interpreted in accordance with, the provisions listed in the right-hand column.
| Expression | Provision of this Act |
| Action (and the taking of action) | Section 183(1) |
| Adverse effect on competition | Section 134(2) |
| Appropriate Minister | Section 132(5) |
| Business | Section 183(1) |
| Change of circumstances | Section 183(1) |
| The Commission | Section 273 |
| Consumer | Section 183(1) |
| Customer | Section 183(1) |
| Date of market investigation reference | Section 137(7) |
| Detrimental effect on customers | Section 134(5) |
| Enactment | Section 183(1) |
| Enforcement order | Section 162(8) |
| Enforcement undertaking | Section 162(8) |
| Feature of a market | Section 131(2) |
| Final determination of market investigation reference | Section 183(3) to (6) |
| Goods | Section 183(1) |
| Intervention notice | Section 139(3) |
| Market for goods or services | Section 131(6) |
| Market in the United Kingdom | Section 131(6) |
| Market investigation reference | Section 131(6) |
| Minister of the Crown | Section 183(1) |
| Modify | Section 183(1) |
| Notice | Section 183(1) |
| The OFT | Section 273 |
| Public interest consideration | Section 139(5) |
| Public interest consideration being finalised | Section 139(7) |
| Publish | Section 183(7) |
| Relevant customer benefit | Section 134(8) |
| Relevant sectoral enactment | Section 136(7) |
| Relevant sectoral regulator | Section 136(8) |
| Reports of the Commission | Section 177(5) |
| Subordinate legislation | Section 183(1) |
| Supply (in relation to the supply of goods) | Section 183(1) |
| The supply of services (and a market for services etc.) | Section 183(2) |
Textual Amendments applied to the whole legislation
F1Act: for the words "solicitor of the Supreme Court of Northern Ireland" wherever they occur there is substituted (prosp.) the words "solicitor of the Court of Judicature of Northern Ireland" by virtue of Constitutional Reform Act 2005 (c. 4), ss. 59, 148(1), Sch. 11 para. 5 [Editorial Note: this amendment will be carried through into the text of the Act at the same time as any other effects on the Act for the year in which the relevant commencement order (or first such order) is made]