Richard Villar - Life on a Knife Edge

Ex-SAS surgeon and author of "Winged Scalpel" Richard Villar describes the difficulties, dangers and occasional impossibility of providing medical aid to disaster areas and warzones, what it's like to land in Haiti in 2010 only 30 hours after the earthquake, how his age becomes an asset when dealing with tribal elders, and why he's in no rush to retire.