This is the recipe from BYO for guiness draught. The recipe I mentioned that involves basically three different beers combines was for the Guiness Foreign Extra clone which is strictly an all-grain recipe.
OG - 1.038 FG - 1.006
IBU - 45 SRM - 40 ABV = 4.2%
14.5oz. Light DME
2.66lbs Light LME (late addition)
1lb 6oz. UK pale malt
10oz. Flaked Barley
1lb Roasted Barley
12AAU East Kent Golding (60)
Wyeast 1084 or White Labs 004
Placed crushed grains and flaked barley in a steeping bag. In a large pot, heat 4.5qts to 161F and submerge grain bag. Let grains steep for 45 minutes at around 150F. While grains are steeping, begin heating 2.1 gallons of water in your brew pot. When steep is over, remove 1.25qts of water from brewpot and add to the "grain tea" in steeping pot. Place colander over brewpot and place steeping bag in it. Poir diluted grain tea through grain bag. Heat liquid in brewpot to a boil, then stir in dried malt extract and hops and begin the 60 minute boil. With 15 minutes left in boil, turn off heat and stir in liquid malt extract. Stir well to dissolve extract, then resume heating. *keep boiling clock running while you stir*. At the end of the boil, cool wort and transfer to fermenter. Add water to make 5 gallons. Aerate wort and pitch yeast. Ferment at 72F. Rack to secondary when fermentation is complete. Bottle when clear.