This whiskey celebrates the craft of Billy Leighton, who is master blender at Jameson. This is a blend of both grain and pot still whiskeys that have been aged in ex-Bourbon and ex-Sherry barrels. Apparently three different spirit types are used in the grain and pot still element and four different barrel age profiles.According to Irish Distillers this 'delivers butterscotch sweetness with a prickle of spice and tannins. Making whiskey requires a fair deal of science, but blending is an art.