First let me state that by no means am I claiming to have used the exact ingredients as SS. I was not trying to clone anything when I brewed this. But serendipity entered the picture, and it tastes like a good foundation for this elusive beer.
Vitals:
OG: 1.058
FG: 1.016
IBU: 33
SRM: 30.5
ABV: 5.5%
Att: 71.4%
Fermentables:
Fawcett Pearl Malt 73.5% (any M.O. or UK pale will do)
Baird's Crystal 150L 12%
Crisp Brown Malt 7%
Lyle's Black Treacle 4.5%
Fawcett Pale Chocolate 3%
Hops:
Fuggle @ 50 min. to 33 IBU
BU:GU 0.57
Water:
Ca 85, Mg 0, Na 65, Cl 111, SO4 52
Est. mash pH 5.42 (Brewfather)
Boil 60 min.
Mash:
Single infusion, 154F for 90 min
Mash-out, 170 for 10 min, optional
Fermentation:
Disclaimer - use WY1469 for potentially more authentic flavor. The info below is "as brewed" for the record.
Safale S-04, pitch at 58F, set temp to 62F
Ferment 2 days @ 62F, then raise temp to 65F
Ferment 4 days @ 65F, then raise temp to 67F
Ferment/condition 5 days @ 67, then package
(11 days total, krausen dropped on day 8)
Packaging:
Chocolate syrup, 1 Tbsp/gal of packaged beer (~3/8 tsp / 16 oz. pint). Dissolve in small amount of boiled water and add to keg. Rack beer into syrup solution to mix well. Chill to serving temp and force carbonate. Optionally, add sugar as well and carbonate naturally to approx. 1.8 vol. CO2 (I have yet to work out the proportion, but it would be based on the sugar content of the syrup you use).
Ideally, serve at proper UK cask cellar temps (11-13C). This is not a beer to serve cold or very fizzy. But that part is up to you.