On the strength of Ian's advice in this article I have prepared a substitute using the last formula he listed. 45% solution of potassium sulfite is easy to get so I adjusted for a 1 liter bottle and adjusted the hydroxide to provide a pH of 13. It appears to work exactly the same as the Agfa Rodinal I have, whether it's their exact formula or not, it's really good and I am happy with it.

Thanks to Ian Grant

Ianol makes 1.3 L

p-Aminophenol (free base) ................... 53 g
Potassium sulfite 45% sol...................... 1L
Potassium Hydroxide ........................... 54 g
Potassium Bromide ............................. 13 g
Benzotriazole 1% ............................... 13 ml
Water to make .................................. 1.3 L

Stock pH 13

I like this for stand development in a Jobo drum, use 20g stock in 2 Liters of water, agitate briefly and develop for one hour..good with TMY, TriX, Delta, FP4 and nice with Rollei Retro 100,