Was it in one of his books or an article? If you have the extract recipe it should be pretty easy to convert, just sub pale malt for the extract until you hit the target OG (depends on your efficiency).
Welcome to the board.
Edit:
A quick search turned out the extract recipe:
6.6 lbs. Munton & Fison’s Old Ale Kit (hopped malt extract syrup) 3.3 lbs. plain light malt extract syrup 1/2 lb. black patent malt 1/2 lb. roasted barley 3 tsp. gypsum 2 oz. Eroica, Galena, Nugget or Olympic hops (boiling): 22-25 HBU 1 oz. Cascade hops (aroma) 1-2 pkgs. ale yeast 3/4 c. corn sugar of 1 1/4 dried malt extract (for bottling)
Subbing accurately for the old ale kit will be a challange. Probably some darker crystal malts involved plus some extra hops.