Part 1: Digital Markets Power to designate undertaking as having SMS Section 4: Link to the United Kingdom
This section sets out the ways in which a digital activity could be linked to the UK for the purposes of designation under section 2(1). At least one of the three criteria set out in paragraphs (a), (b) and (c) must be met.
	Paragraph (a) refers to the activity having a significant number of UK users ("UK user" being defined in section 118). For example, provision of a search engine service, with some operations physically located elsewhere, could be linked to the UK if the activity had a significant number of UK users.
	Paragraph (b) refers to where the undertaking that carries out the digital activity carries on business in the UK in relation to the digital activity.
	Paragraph (c) refers to circumstances in which the digital activity, or the way in which the undertaking carries on the digital activity, is likely to have an immediate, substantial and foreseeable effect on trade in the UK.