Whisky Tamdhu 12 Year Old. Tamdhu Speyside Single Malt Scotch Whisky has introduced its new 12 Year Old to its exclusively sherry oak matured range. The new 12 Year Old single malt reflects Tamdhu's commitment to producing ‘only the best’ sherry cask matured whisky, and will replace the existing Tamdhu 10 Year Old. Benefiting from an extra two years of maturation, and bottled at 43% ABV, Tamdhu 12 Year Old has been 100% matured for a full 12 years in first fill and refill American and European Oloroso sherry casks from the cooperages of Jerez, in Spain’s ‘sherry triangle’. The result is a complex and rich single malt whisky that delivers a wealth of complexity, with flavours of cinnamon, dried fruit, banana and classic sherry oak depth.