DENVER, Colorado--(BUSINESS WIRE)--InfraVia, Liberty Global (NASDAQ: LBTYA, LBTYB, and LBTYK) and Telefónica (TEF) have announced an agreement to acquire Substantial Group. Founded in 2019, Substantial Group, owned by investors Advencap, DigitalBridge and Soho Square Capital, is the UK's second largest alternative fibre provider, expected to have more than 3.4 million fibre premises and over 500,000 customers by completion. The acquisition will be made by the parties' joint venture company, nex.