The original Ilfospeed papers didn't actually need a developer you could process them with an Activator/Stabiliser machine, I used an Ilfopring machine with home made activator (Sodium Hydroxide, Sodium sulphite and Kbr) and Hypam at 1+4 instead of stabiliser. The results were indistinguishable from paper processed in Ilfospeed developer.

At the time Ilford kept very quiet about this as they were promoting their newer Ilfospeed processors.. So original Ilfospeed would still develop in a developer that's collapsed becasue of the inherrent alkalinity.