Ok, I've come up with a recipe for the brew.
I was just going to do Gales, but they don't have torrified wheat at the shop, and I thought I'd try not using sugar, so I've converted all the sugars from torrified wheat and white sugar to pale malt. In addition, I've reduced the amount of challenger and increased the amount of Fuggles, as I already have the challenger and am not sure it is in peak freshness. Finally, I've added some extra goldings half an hour from the end as I was naively impressed by a
http://www.brewsupplies.com/hop_characteristics.htm which told me to do it.
Hop IBUs have been calculated at a 20% utilisation rate at start of the boil; hops at half an hour approximated as 2/3 of this utilisation (12%), and last 15 mins 7% (1/3). (used info
http://byo.com/spreadsheet/).
OG: 1042 meaning about 4.5% alc at a 75% efficiency and 25 litres
4.5 kg Pale Malt
215 g Crystal Malt
Fuggles 13 IBUs (about 35g) - Start of boil
Challenger 10 IBUs (about 16 g) - Start of boil
Goldings 4 IBUs (about 15g) - half an hour from the end
Goldings 1.5 IBUs (i.e. 10g) - 15 mins from end
Irish Moss - 15 mins from end.
Total IBUs - about 29-ish, 24 if only measure copper hops.
Mash 90 mins at 66 C; Boil 90 mins.
'Water treatment' - Pre-boil water, 1 tsp gypsum, 1/2 tsp Epsom salts (from Dave Line BBLTYB).
Any tips? Not sure this is the final version and may tinker some more. Not want to risk over-bitterness, but want reasonble hoppyness to balance malt.