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Sorry, but I admit to being a devotee of concrete bases for patios, they don't move and wreck the surface! Even compacted Type 1 Roadstone can be affected by ground heave/shrinkage or invasive root systems.
For a more rustic look I would recommend randomised sandstone in a blended colour mix. For obvious reasons I only have pictures of just laid, wet, areas. It very rapidly weathers and mellows. If you are very lucky you might even get a fossilised plant on the surface (bottom l).
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That is why I asked on here, suspected there may be some technical issues and after doing rough calculations I realised that it wouldn't be a cheap option, just because I had 250 bricks already.
If I don't mind it it being 'rustic' is there any way it can be made to work without concrete? If not, what other surface materials would you suggest? We want it to be quite natural and blend in, not stand out as a big mass of shiny stone?