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TBH that's what I was originally thinking (or some breeze blocks under the batons)...
...But then ffm man-sold me an over engineered solution.
It's destination is currently a "flower" bed. FWIW we have exceptionally heavy clay and the contents will likely be; gas BBQ, gas, some other random shit.
The only reason for double checking solutions is because it's on the northside and will be up against a fence.
Just to double check my working. 70 inches X 30 inches = ~1.35m² which means I need 22ft² / 2m² of this stuff right?
https://www.ebay.co.uk/itm/DRIVE-GRIDS-PLASTIC-PARKING-GRID-HEAVY-DUTY-MEMBRANE-ECO-BASE-GRAVEL-GRIDS-nw/192637420339?hash=item2cda15c333:m:mdMHZVGwP0tBBkU8vzKI--A&var=492779995444
Cheers.