I recall that Silverprint says it is no longer available somewhere on their site - hang on...
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Here it is:
Fotospeed LITH DEVELOPER
Smallest pack of liquid lith developer generally available, also available as a 5+5 litre bulk pack, useful now that the Champion Photochemistry bulk lith developer has been discontinued.
I think it went out a few years ago. For what it is worth, I managed to replicate a print made with Champion before its demise using Maco and the colours I obtained were virtually the same.