Gracias!
I did wonder whether the new type of soaking degreaser I’m using might not be all that good, so chucked a couple of Lily Whites in too. And actually I think it is quite good - this is definitely the cleanest I’ve ever had these two. Particularly the old Pike one on the top, which had been a kinda caramel colour for a while.
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FWIW @Legion - this appears to be M10's homegrown, all-Australian, take on Simple Green. It's not quite as concentrated as SG I don't think, but seems to be doing the job on (at least some of) my stones: