The town of Midleton, near Cork City, is home to the largest distillery in Ireland, aptly named the Midleton Distillery. This distillery is part of the Pernod-Ricard group of companies, and it is home to a variety of Irish Whiskey Brands. Powers, Paddy, Tullamore Dew, and Red Breast all are distilled at the Midleton Distillery, as is of course, the largest selling Irish Whiskey Brand in the world, Jameson. (Incidentally, the Jameson Brand is also part of the Pernod-Ricard conglomerate of companies.)
The Jameson 18 Year Old Limited Reserve Irish Whiskey is a blended Irish Whiskey, the components of which are matured for a minimum of 18 years in a combination of American Bourbon Oak and Spanish Olorosso Sherry Oak Casks. The whiskey includes both grain and pure pot still whiskey varieties and is finished in fresh fill Bourbon barrels. This is the upper end of the Jameson range, and although it has been in regular production since 2002, it is considered to be a connoisseur’s whiskey and is produced in rather limited quantities each year.
Here is a link to the review of the #30 spirit on my Rum Howler Top 100 Spirits Countdown of the best spirits I have ever tasted.
#30 – Jameson 18 Year Old Limited Reserve
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You may follow my Countdown list of the 100 Best Spirits here: The Rum Howler 2015 – Top 100 Spirits
The Highland Park 25 Year Old Whisky is blended with up to 50 per cent of its whisky coming from the matured (1st refill) Spanish oak, and it is bottled at 48.1 per cent alcohol by volume. This is a full 20 % higher than the 40 per cent bottling strength we typically see in North America. The combination of the higher bottling strength and a larger portion of Spanish oak whisky in the blend will bring forward a stronger more assertive aroma and flavour than the other whiskies in the Highland Park portfolio, and may even make the whisky a little intimidating at first tasting.
The Calgary Stampede (Commemorative) Whisky is a single bond offering produced entirely from corn distillate and aged for 25 years in charred American white oak. It is blended entirely with naturally sourced Rocky Mountain spring water, and was limited to a production of only 6000 bottles. In order to maintain good contact with the oak during the lengthy aging process, this bond was re-gauged or re-barreled twice during its aging life. New barrels were not introduced when Highwood distiller’s made the liquid consolidation. Instead they chose to maintain the aging process in the original barrels into which the spirit began its maturation.
I am not sure exactly what happened to Oliver and Oliver as current information about their company is very hard to find. However, the 
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