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Had to go to Whitchurch today so ain't had much time, the step down on the timber from the slab is 50mm, 12mm for the mortar bed and 38mm for the paving slabs, the concrete sub base will be 50-60mm thick.
Bingo, that's four jumbo bags of ballast of ballast and about 20 bags of cement. The shed came this morning, in two manageable box's, so off on a slab matching trip in an hour or so.