This formula is closely related to Geoffrey Crawley`s FX-9 and FX-10 developers and is published in a book called RAYCO REVEALS.

Sodium Sulphite, anhydrous = 100 grams
Hydroquinone = 6 grams
CD-4 = 8 grams
Borax = 4 grams
Boric acid = 3 grams
Water to make 1 Litre.

Develop Ilford FP4 Plus for 8 minutes at 20*C. Other films by test strip and don`t forget to experiment with the formula.