The present formula at 1:50 is:
Metol base 0.8g/L ,Sodium sulfite 1.7g/L .Sodium hydroxide 0.35g/L.
GW Crawley ,BJP Jan6 1961 suggested:
Metol 0.5g/L ,Sodium sulfite 1g/L ,Sodium carbonate 3g/L.
There is half a page about this,it cannot be summarized here,but notably he appeared impressed with the sharpness of it with the film of that era,Adox KB 17 etc.He noted the working solution had a short shelf life but did not suggest a concentrate.It's possible the present formula might have a better shelf life and be sharp.I wonder if it is known what is the effect of using metol base instead of metol.