Glendullan is one of those big but little-known Speyside whisky distilleries. This is due to lack of promotion in the UK by owners Diageo, who use most of its massive production for blending. Glendullan is much more familiar to whisky fans in the US market, where the distillery's single malt is marketed as Singleton of Glendullan.

Glendullan had two brand new stills installed in 1962 and was modernised in the process with the removal of the worm tubs and conversion to steam heating. Thankfully there are bottlings from this original distillery so we have some idea of what the original distillate was like. In 1972 a second, and very modern, Glendullan distillery was constructed next door to the original one. This one was a big blending beast with six stills and the most modern equipment available. The original Glendullan distillery was sadly closed in 1985, but while it was operational the spirit from both distilleries was vatted together for official releases.