Ministers should implement a series of measures – including lower speed limits on the roads – to prevent Donald Trump’s war on Iran causing long-term damage to the UK economy, a Labour-linked think tank has said. Modelling by the Institute for Public Policy Research (IPPR) suggests inflation could rise to 5.8 per cent if the conflict in the Middle East continues, costing the Treasury up to £8bn a year in higher debt interest payments and slashed tax revenues. In response, the organisation says the government should bring in a temporary energy price cap of £2,000 to curb inflation and a 10p cut in fuel duty. These should be coupled with broader energy demand reduction strategies, such as lowering speed limits, they say.…