Hi Monkey..
heres my 'house stout', for want of better expession. I think i did it once but with another hop, (Progress i think, but cant be arsed checkin

) but personally, Challenger works well for me.
Here goes
Top Dog Stout
Fermentable Colour lb: oz Grams Ratio
Pale Malt 5 EBC 8 lbs. 5.9 oz 3800 grams 72.1%
Roasted Barley 1350 EBC 1 lbs. 6.2 oz 630 grams 12%
Torrefied Wheat 4 EBC 1 lbs. 0.6 oz 470 grams 8.9%
Chocolate Malt 1050 EBC 0 lbs. 12.8 oz 365 grams 6.9%
Hop Variety Type Alpha Time lb: oz grams Ratio
Challenger Whole 7.6 % 60 mins 0 lbs. 1.8 oz 52 grams 100%
Final Volume: 23 Litres
Original Gravity: 1.050
Final Gravity: 1.018
Alcohol Content: 4.1% ABV
Total Liquor: 33.6 Litres
Mash Liquor: 13.2 Litres
Mash Efficiency: 75 %
Bitterness: 40 EBU
Colour: 410 EBC
Of course, tweak away to suit your tastes, but its a decent base to work from..
Happy brewin, anyway, cheers, dave.