Want to experience the best chocolate you’ve ever tasted? You’ll find it in Vietnam, says Lawrence Osbourne.

Formerly a travel writer - and a person apparently accustomed to excelling in pretty much every area he delves into - British novelist Lawrence Osbourne is something of a throwback to the classic 1930-50 literary period, a time when the likes of Evelyn Waugh and Graham Greene were in their prime, setting standards few could ever hope to attain, let alone emulate.