The UK’s communications watchdog has called for a probe into Microsoft and Amazon’s dominance of the country’s cloud computing market in the latest challenge to the tech giants from global regulators. Ofcom said it was concerned that, if unchecked, the concentration of cloud computing supply in the hands of a small number of large US companies could lead to British customers paying more and smaller groups being squeezed out of the market. ”Microsoft said: “We remain committed to ensuring the UK cloud industry stays highly competitive, and to supporting the transformative potential of cloud technologies to help accelerate growth across the UK economy