As I was about to come off duty at 20:00, we had an emergency blues and twos call from the control room asking for an urgent transfer of blood from the blood bank at the Mater, to a patient at RVH who was bleeding out on the operating table. Join me as I fire up Mike Zero Two for a late-evening dash down Belfast's Crumlin Road and on to a relatively deserted West Link for the short run to the trauma centre at the Royal Victoria Hospital.