Jurisdiction(s):
United Kingdom

Related legal acts

Key definition

Chapter II prohibition definition

What does Chapter II prohibition mean? The Chapter II prohibition is the UK competition law rule that bans abusive conduct by one or more undertakings holding a dominant position where the conduct may affect trade within the UK. It is set out in section 18 of the Competition Act 1998 and interpreted having regard to pre‑Brexit EU case law on Article 102 TFEU (section 60A), though UK authorities and courts may depart where appropriate. It is enforced by the Competition and Markets Authority (CMA) and concurrent sector regulators; it also underpins follow‑on and standalone damages claims. It targets unilateral conduct. Key features include assessment...

Chapter II Prohibition on Abuse of a Dominant Position: UK Market Definition, Single and Collective Dominance, Brexit Divergence, and Exclusionary and Exploitative Abuses - Guidance and Case Law

Published by a LexisNexis Competition expert

Practice notes

In the UK, unilateral or ‘dominant’ firm behaviour falls within section 18 of the Competition Act 1998. Section 18(1) of Chapter II provides that conduct by one or more undertakings amounting to Abuse of a dominant position in a market is prohibited if it may affect trade within the United Kingdom.

the abuse need only have the potential to impact trade within the UK, and
the dominant position must exist within the UK (even if the abuse occurs outside the UK)

‘UK’ refers to the United Kingdom or any part of it. There is no requirement that the part be ‘substantial’.

Otherwise, the analysis of the applicability of the will mirror Article 102 TFEU, namely:

is there a dominant position? This involves defining the market and evaluating the allegedly dominant undertaking’s position in that market, and
is the conduct at issue abusive?

This Practice Note offers a general overview of the application of the, focussing in particular on those two issues.

Brexit

On 31 January 2020, the UK ceased to be an EU...

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Web page updated on 27/05/2026

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