This is actually the book I was mentioning, the 300 recipe version.
Young's Double Chocolate Stout
For 19L it calls for and OG of 1.053, FG of 1.013, 28 IBU's, SRM of 35 & ABV of 5.2%.
3.2 Kg Pale ale malt
0.31 Kg English medium crystal malt
591 ml Choclaca liquid cacao
0.34 Kg Lactose sugar (15min)
0.23 Kg Invert sugar - 70L (15min)
0.11 Kg Cane sugar (15min)
0.17 Kg Cocoa powder (15min)
40g Fuggle hops (60min)
7g East Kent Goldings (15min)
1 tsp. Irish moss (15min)
1/4 tsp. yeast nutrient (15min)
9.4g natural chocolate extract (secondary)
Wyeast 1768 (English Special Bitter) or 1968 (London ESB)
Mash at 67 for 60 minutes, ferment at 20 degrees.
I'm a bit dubious of the color for this recipe, no roast barley or chocolate malt? There is chocolate malt mentioned in the initial description but not under ingredients "Young's uses a blend of real dark chocolate and chocolate essence, as well as crystal, chocolate malt and lactose". I'll use this as a starting point but would use MO in lieu of Pale, add some oats, chocolate & munich. Still not sure on their yeast selected, 1318 (London Ale III) has some of the better reviews concerning sweet stouts.
Got the best result using
Prestige Cream De Cacao tastes just like the chocolate in Youngs and being fully water/alcohol soluble it wont stuff up the head like Coco or nibs or whatever will.
I was planning on using the cocoa nibs (adding at bottling after steeping in a tincture for a few weeks & straining) would this still adversely affect the head?