Rishi Sunak has pledged to provide extra support for households with their energy bills if he wins the Conservative leadership contest as Cornwall Insight forecast the price cap will peak at more than £4,400 in April next year. The former chancellor of the exchequer, who is lagging behind foreign secretary Liz Truss in the two-horse race, made the commitment after Truss recently rejected “handouts” for households struggling to pay their bills.