Vertical agreements may be prohibited by section 2(1) of the Competition Act 1998 (CA 98). The Digital Markets, Competition and Consumers Act 2024 (DMCC Act) amended section 2 to apply to agreements implemented outside the UK in certain circumstances. The prohibition applies to agreements between undertakings, concerted practices, or decisions by associations of undertakings which have the object or effect of preventing, restricting or distorting competition within the UK or part of the UK and which, where implemented, or intended to be implemented, may affect trade in the UK or part of the UK , or, in any outer case, are likely to have an immediate, substantial and foreseeable effect on trade within the UK or part of the UK. Section 2(3) CA 98, which previously required the agreement to be implemented (or intended to be implemented) in the UK was repealed with effect from 1 January 2025.. As noted above, the DMCC Act amended the definition of the Chapter I prohibition so that it can apply to agreements, concerted