Vodafone is to take full ownership of its VodafoneThree business in the UK after striking a £4.3 billion deal to buy out partner CK Hutchison. The VodafoneThree business was formed last year after the merger of mobile operators Vodafone and Three in the UK, with Vodafone taking a 51% stake in the joint venture and Hong Kong-based Three owner CK Hutchison taking a 49% stake. VodafoneThree became the UK’s largest mobile operator following the deal and is one of the country’s fastest-growing broadband providers. The companies said the new deal values VodafoneThree at £13.85 billion including debts. Bosses said they had seen a “strong start to the integration” of the merged brands, putting them on track to secure around £700 million of annual cost efficiencies by 2030. Margherita Della Valle, chief executive of Vodafone Group, said: “A year on from the merger, the team has made remarkable progress as we maximise the full potential of VodafoneThree and capture the significant synergies.…