30 years of London's Air Ambulance: Saving the capital's critically injured...
 

Although not strictly about the helicopter-ing and more about the clinical outcomes, I'm sure some of you will be fascinated about this, if you don't know about it:
https://www.eventbrite.co.uk/e/30-ye...ts-63466750760

While a plank-driver, I don't have any association with event and simply found out about it on a science communications bulletin board.

Looks like a fascinating insight.