I'm thinking of that paving with gaps for my front garden, but DIY. If I'm digging down to lay a hardcore base for the paved bits, do I just leave topsoil in place where the gaps are?
Best method is non-woven geo-textile under the slabs,
(prevents weed growth and soil-heave),
with gaps filled with resin-bound gravel to ensure
storm water can drain between the slabs into your soil.
Maybe sandstone like this with a few stones missed out for planting? I could possibly do this for you.