https://blog.eckraus.com/ipa-session-beer-recipe-all-grain-extract
All-Grain Directions:
Mash the crushed grains in about 1.5 gallons of clean, chlorine-free water for two hours. Lauter and sparge, collecting about 6.5 gallons of wort in the brew kettle. Bring to a boil and boil for 90 minutes, adding hops according to schedule. Mix in the brown sugar at the end of the boil. Chill wort to fermentation temperature and ferment at 70˚F until complete. Bottle or keg and enjoy!
Partial-Mash Directions:
Replace the English pale malt with 3.1 lbs. light dry malt extract. Mash the crushed six-row malt in 2 qts. of water, then sparge. Add enough water to make a 3-gallon boil and mix in the malt extract. Bring to a boil. Increase the 90-minute hop addition to 3.5 oz. and the 20-minute hop addition to 1.5 oz. Continue with the recipe above.
Incidentally, Whitbread yeast is derived from that brewery. Safale S-04 is the dry yeast version.