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@ColinTheBald
Further tedious note: allow 1 to 1 1/2 mixes per post if you haven't dug the hole too big. If using 25kg bags of ballast fom your (un)friendly local builders merchant, one shovel of cement per bag, a bag of cement should do 5 bags of ballast. Should you find that your final panel needs cutting down, I shall add a further boring tutorial.