London's Air-Ambulance became Britain's first emergency service to carry blood whenever they're called to an accident. Experience has shown that when soldiers have been seriously injured in battle, an immediate blood transfusion can increase their chances of survival.
Phil Bayles reports now on how the same pricinple will now be applied around the capital.
More top news
Harry and Meghan weren't the only ones at the center of attention on Saturday. This policeman kept people entertained.
Deadly violence has returned to the streets of the capital as a man is stabbed to death in south London.
Two weeks of poignant tributes from family and friends remembering Grenfell Tower fire victims will be heard by the public inquiry.