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
The OktoberFest beer festival, due to take place this weekend, has been cancelled at the last minute.
Drivers and rail passengers are being told to expect delays after a lorry became wedged underneath a bridge in Bromley.
Your pictures of foxes in surprising places around the city, and some surprising facts about foxes.