Batch 0614C of Glenlivet's wonderful Nàdurra range is once again matured in first-fill bourbon casks for 16 years, bottled in small batches and presented at natural cask strength and without chill-filtration. 'Natural' is the name of the game here (and name of the whisky too, as 'Nàdurra' is Gaelic for 'Natural').