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ghostface
mespilus
Any reputable supplier of aggregates should have a 'draining Type 1' available.
Rather than 56mm to dust, I've seen, in London a 40-20mm sieving offered.
Still compacts down, with sufficient interlock, but plenty of voids to allow permeability.
Remember to wrap this layer of permeable aggregate in a geotextile to prevent soil heave and fines washing in to block the voids