By Jessica Frank-Keyes Jeremy Hunt has insisted he won’t borrow to fund tax cuts in what he said would be a “prudent and responsible” Spring Budget this week. The Chancellor told broadcasters today that he hoped to use Wednesday’s fiscal event to show voters a “path” heading in the direction of tax cuts, but warned any specific reductions would have to be “sustainable” and “affordable”. It follows the Treasury announcing plans to slash wasteful Whitehall spending in a bid to boost public sector productivity, which Hunt suggested could save up to £1.8bn by 2029. The Sunday Times reported that H…