Liz Truss and Mel Stride were Treasury ministers together.Liz Truss has launched a furious attack on Mel Stride after he criticised her disastrous mini-Budget.In a further sign of Tory splits, the former prime minister – who only lasted 49 days in office before being ousted – described the shadow chancellor as “a creature of the system”.“Nothing will change with people like him in charge,” she said.Truss was responding to remarks Stride is set to make in a speech on Thursday in which he will say the Tories’ reputation for economic competence has still not recovered from the mini-Budget, which saw Kwasi Kwarteng announce £45 billion-worth of unfunded tax cuts and cause financial chaos.He will say: “For a few weeks, we put at risk the very stability which Conservatives had always said must be carefully protected.“The credibility of the UK’s economic framework was undermined by spending billions on subsidising energy bills and tax cuts, with no proper plan for how this would be paid for.”