^ this, pretty much. Hops could be multitudinous combos, though. EKG + Fuggle throughout; fuggle 60, fuggle + styrian 20/0; fuggle 60, EKG + styrian 20/0; same, same, but EKG + fuggle, Styrian + EKG, Northdown @ 60 then any combo thereafter, challenger throughout, challenger @60/20 ekg and/or fuggle and/or styrian@0......lots of permutations, combinations....Oh, I forgot Bramling cross.Pale malt extract to the desired gravity (about 1045 -1055 is probably good).
250-300g Simpsons heritage Crystal (assuming a 20-23 litre final volume)
Challenger and East Kent Goldings in equal additions at 60, 20 and 0 to hit an IBU between 35 and 50 (personal taste)
1028, 1968 or 1469 from Wyeast.
1968 seems to result in higher FG from my experience so you might consider replacing a portion of the extract with dex or some kind of invert sugar (say around 15-20%)