This company is Britain’s biggest water and waste-water business, with 15m customers in London and the Thames Valley. Led by chief executive Martin Baggs, 51, the company increased turnover to £2bn in 2016. In March, the construction of Europe’s largest floating solar farm, expected to generate enough energy to power 1,800 homes, was completed on the Reading firm’s reservoir near Walton-on-Thames.

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Company details
CompanyThames Water
ActivityWater services provider
Sales £m2,047
Profit £m1,163
Year endMar 16
Principal shareholdersConsortium led by Macquarie European Infrastructure Fund II

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* Supplied by company † Annualised figure