It was at the height of the 2005 general election that Channel Four News received a letter from Howard Mansfield. He detailed the tragic events leading up to the death of his partner Jacqui McCoy - a catalogue of missed opportunities by doctors to treat her. It was a story that asked questions of the NHS - at a time of record investment, was this a failure to change a culture? Channel 4 News has spoken again to Howard Mansfield and heard a surprising story - how the health service reacted to his complaints by changing protocols, apologising, and even promising to build a new cancer ward.