Heathrow airport has been recognised as the safest place in London to suffer cardiac arrest. With 180 defibrillators and 100 staff trained in first aid, the 70 million passengers that pass through Heathrow airport each year should feel confident that they are in safe hands. However, the same cannot be said for the aircraft. 

Could you tell me what you had for dinner every night last week?  Or how about what you picked up from the shops last Monday? It can be very easy to forget things that only happened a short time ago, never mind 3 years ago!