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I was assuming just soil between the slabs with grass or sedum or something. The runoff would soak away pretty quickly I expect.
If you want gravel between them then yeah, whatever @ColinTheBald says to do
rhowe-
I think it needs some kind of sub base, even if just to get the levels right. My experience of type 1 was that drilling a hole in the bottom of my pond to drain it didn't really work, very slow. I live in the wettest city in the UK apparently so it's top of my mind to get drainage right.
Anyway called a local supplier, they do type 3 but didn't have it on their website. I'll use a couple tons of that.
Polygon
Perhaps more so, it's not gonna be 1 big slab it'll be max 600mm wide strips with 50mm gaps, so the runoff from those steps will be concentrated in the remaining gaps.
Seems like grano is often used for artificial lawns so this is probably the way to go, especially as I already have a bulk bag sitting in the garden, possibly mixed in with some 20mm crushed stone.