How long must all Scotch whisky be aged in oak casks according to regulations?

Scotch whisky must be aged in oak casks for a minimum of three years in order to meet the legal requirements set by UK regulations. This aging process is crucial because it allows the spirit to develop its flavors and character, resulting in a smoother and more complex product. The three-year minimum is a standard that ensures all Scotch whisky has undergone significant maturation, which is essential for quality. This aging period distinguishes Scotch from other spirits and is part of what defines it as a category, ensuring a level of quality and consistency in the final product that consumers expect from Scotch whisky.