The $19 billion tie-up will be scrutinised by Britain's Competition and Markets Authority, the antitrust regulator which made global headlines in April when it blocked Microsoft's $69 billion acquisition of "Call of Duty" maker Activision Blizzard. The long-awaited mobile deal reduces the number of networks from four to three, challenging a tenet long held by regulators that four help to keep prices low in major markets. "The government's desire to make the UK a 5G powerhouse requires a lot of investment," he said. One London-based investment banker, who declined to be named, said he put the chance of the deal receiving the green light from regulators at 50%. A major telecoms investor said the deal could be approved, but only with strong remedies, and that could risk undermining its rationale.

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Persons: CK Hutchison, Activision Blizzard, Hutchison, Paolo Pescatore, Peter Broadhurst, Moring, James Gray, Sarah Cardell, Robert Finnegan, Gray, Paul Sandle, Amy, Jo Crowley, Sinead Cruise, Kate Holton, Emelia Organizations: Microsoft, Activision, Hutchison, O2, Vodafone, CK, HK, Britain's Competition, Markets Authority, Ofcom, European Commission, Foresight, Hutchison's, UK plc, Victoria, Crowell, CMA, Reuters, National Security and Investment, Britain's, Tesco Mobile, Telefonica, Thomson Locations: Hong Kong, Britain, Europe, China, London, Germany