NEJM -- Nationwide Public-Access Defibrillation in Japan

This authoritative and massive report confirms the value of rapid access to AEDs in public places.
It bears relevance to the UK where sadly we are way behind many other countries where AEDs are literally everywhere. In some states in America you are never more than 2.5 minutes away from a defibrillator.
NEJM -- Nationwide Public-Access Defibrillation in Japan