The summer flying season for Britain's world-class pilots is well underway and tensions are running high. At the UK's largest air show in Gloucestershire, the Red Arrows are battling with the weather.Recreating an 18-plane World War II scramble is putting the RAF Hurricane pilots through their paces. And to salute the Battle of Britain veterans, the Typhoon fighter jet pilot has a very special ace up its sleeve... an emotionally charged synchro with a Spitfire.