Blood supplies have been flown between two hospitals by drone in a trial the company behind the scheme hopes will be rolled out across the country. 10 identical blood packs made the 68km journey from the Wansbeck hospital to Alnwick and back again in the northern county of Northumberland. Half were transported by drones flying at more than 100kph, with the other five going by road. Researchers found that the quality of the blood delivered by drone wasn’t affected, with lab results showing no discernible difference in damage to blood cells or changes in levels of potassium. “The results of this…