David Hayman feels that the Scottish terrain and air are just as important as science in the creation of the drink. He visits Islay, rejoicing in the land and people who make it The Whisky Island. On Speyside, he encounters the progression of whisky from illicit distilling to a landmass dominated by global brands. Scotch whisky’s profile and sales would be lost without marketing – though image does not always meet with reality, as Hayman learns. Finally, at a fine whisky auction, the tale of Scotch’s lucrative investment and collection sub-industry is told.

• David Hayman