Yes, the debt will be higher and interest on that debt will have to be paid, but the British government can borrow now at extraordinarily favorable terms. When interest rates are low and you can borrow on favorable terms, the market is telling you to pull government spending forward into the present and push taxes back into the future.
维持巨额预算赤字直至经济完全复苏有何弊端？诚然，债务负担会有所增加，而债务利息也必须支付，但英国政府现的借款条件还颇为宽松。较低的利率和较宽松的借款条件表明，市场所要告诉你的就是在现在增加政府支出，在未来增加税收。