From Glenglassaugh's third batch of Rare Cask Release expressions comes a 47 year old single malt finished in a single Pedro Ximenez Sherry puncheon. Cask 2230 was filled all the way back in December 1968 and cracked open in November 2016, with 404 bottles produced. Batch 3 of the Glenglassaugh Rare Cask Release features whiskies all aged for at least 30 years. Blimey.