On 17 October 2019, the CAT allowed interventions by CityFibre and British Telecommunications (BT) in the appeal by TalkTalk Telecom Group plc and Vodafone Limited against Ofcom’s finding that BT does not enjoy significant market power in the market for high speed business services (leased lines) in the UK. Ofcom’s decision affects the regulatory conditions to which BT should be subject. The CAT determined that CityFibre would be materially impacted by the outcome of Ofcom’s decision and that its inclusion would not add time or complexity to the case. The CAT also considered that CityFibre’s market information would assist the CAT in making their price control determinations.