After a few 5litre iterations I think I'm close.
ABV: 6.6%
IBU: ≈40
Colour: 23°SRM/45°EBC, dark brown
Grainbill: 90% Pale, 7.5% Crystal Malt, 2% Chocolate Malt, .5% CaraPils/Dextrose Malt
Bittering hops: Fuggles, Sovereign (60 min)
Aroma hops: Cascade, Stryian Goldings (15 min)
Yeast: tried...