New analysis has identified the towns and cities in Great Britain where households are most vulnerable to rising energy costs . War in Iran and the closure of the vital trade route the Strait of Hormuz have driven a sharp rise in fuel prices in recent months , with the increased price of oil affecting the cost of petrol and diesel. The big factor in most people’s domestic energy bills is gas prices rather than oil – the exception being off-grid customers who rely on heating oil, for whom the government has already offered some support. Gas prices have risen since conflict began but customers have so far been protected by the energy price cap. As such, it is still not certain exactly how hard households will be hit by higher energy prices in the coming months, with Ofgem set to announce on 27 May what the price cap will be for the three months covering 1 July to 30 September 2026, but a significant increase in bills is expected.…