Coopers regular series stout (edit: haven't used the Thos Coopers version as I've found the regular series does the job fine) is the jewel in their crown. It hits the spot for replicating a Guinness type stout in that it has fairly low malt flavour, good roast and no perceivable hop aroma or flavour with the hops supporting the roasty dryness and body. The roast character nicely hides any kit 'twang'.
I'd enhance it by using an Irish Ale yeast if some slurry in storage, but OOT to buy a Wyeast specifically for this brew.
I'd also vote "why go AG for a dry, smooth low hop, low malt but good roast quaffing stout when you can buy a tin of this".