Had a try at this one for my second AG Brew. Kept the recipe almost as stated at the top of this thread, but reduced the hops to 60g in total, based on some of the earlier comments. Second runnings stayed good and dark, so managed to get about 34L from the mash. I only have a 30L Burco though, so ended up having to dump some - Booh!
By topping up the Burco as it evaporated, I managed to get 28L at the end, with an OG of 1.064. Based on the earlier photos of lively fermentaion, I split the 28L between my 25L fermenter and a gallon demijohn to allow room to grow. Bucket is bubbling like it's posessed, but seems contained. Demijohn is bubbling out through the bubbler, so I'm having to keep an eye on it.
Will let you know how it turns out. Thanks for posting the recipe.
One question - I'll be bottling the finished article. What would you recommend priming with, corn sugar, or a spot more treacle?