Kernel, Imperial Brown Stout - Tormore and Port Dundas BA

Is this a blend? I'm assuming Tormore (single malt) and Port Dundas (now owned by Diageo apparently) are separate entities...

Served cold. Whiskey nose, big whiskey taste: scotch (banana) and some wood. Surprisingly sweet for a Kernel stout. Finish is a massive whiskey dryness well mixed with hop bitterness (signature Kernel impy).