 In 1971, Irish Distillers closed its Dublin distilleries (including Bow Street) and consolidated production in Midleton.As a result, the makeup of the whiskey was altered for the first time in known history.This change, coupled with low stocks of maturing whiskey, led Mitchell & Son to make an agreement with Irish Distillers to mature the whiskey onsite in Irish Distillers' own casks, with Mitchell & Son having sole rights to market, sell, and develop the whiskey.