Britain’s two largest steelmakers have warned that President Donald Trump’s tariffs are already causing a decline in business from American customers, with further economic damage expected in the months ahead. Tata Steel, which operates from Port Talbot, and British Steel, which runs the Scunthorpe steelworks, say the 25% tariff on British steel and aluminium exports to the US has “spooked customers” and is forcing them to seek alternative suppliers. In a hearing before MPs on...