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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?
cjr-
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).
ColinTheBald
I won't comment on design, but on pure technicalities the bricks are probably a bad idea. Interior bricks are unlikely to be frost proof, virtually impossible to match and laid on sand areas WILL sink. Also, for an area of 25 metres you will need 1100 bricks at £1 per brick if you're lucky, these should be laid on concrete with a fall of a degree or so to clear water if you want the area to last 5 minutes.
Better, cheaper and easier to lay surfacing materials do exist....