A couple have hit out at Royal Mail after going four weeks without any post including birthday cards and tax letters.br br Damien McArdle, 44, is yet to receive a single card for his birthday on October 13 and said the 'ridiculous' delays are now affecting his work.br br The entrepreneur, from Maidstone, Kent, is waiting from a letter from HMRC to give him a code to begin invoicing clients after launching a new company.br br The Royal Mail insist the couple are awaiting no letters - but Damien says he is yet to receive items he knows were send to him weeks ago.