Colin Thubron&rsquos books have been translated into 20 languages, won heaps of awards, and he has been ranked among the greatest post-war British writers. It was Mirror to Damascus (1967) that set him firmly on the road to travel writing legends, and after The Hills of Adonis A Quest in Lebanon (1968), Jerusalem (1969) and Journey into Cyprus (1974), he forsook intimate accounts of small countries to demystify vast nations mired in incomprehension (notably Among the Russians in 1981 and Behind the Wall A Journey Through China in 1987). The &lsquolast of the gentlemen writers&rsquo, born 1939, is gangly, dapper and weather-beaten. Excerpts from a conversation.