• If they've gone nowhere in 100 years they're not about to, go straight over the top! What you could do is remove a couple of lines of cobbles where the shuttering will go and go 3" deep over the remaining cobbles with your concrete. Unless you are storing elephants, 3" of concrete over a solid base would be plenty.

  • Excellent, its just for one of those large paddling pool things, so weight is spread out.

    Will use the digger to ping out a row of cobbles to put the shuttering in, no way I doing that by hand...

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