LABOUR was urged to back hard-up Britons by closing energy tax loopholes after Shell reported “obscene” £5 billion profits thanks to the Iran war today.Europe’s biggest oil and gas producer sparked fury as it reported better-than-expected quarterly takings after the Middle East conflict sent energy prices soaring.New analysis today showed energy giants have raked in more than £26.2bn in the first three months of the year, including around £3bn from Britain alone.