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  • Have a look at Toolstation item 42827, (2 x 32 x 32 x 300mm galvanised angle),
    in each internal corner,
    drill the holes out to 5mm to accept TS 14627, (5.0 x 80mm Torx woodscrew),
    with 3mm guide holes about 20mm into the sleepers.

  • Sounds like a good plan. Would you put them straight on the soil or some gravel for drainage?

  • @mespilus and I implemented what he described. It certainly looks very neat, but a less labour intensive option (assuming you don't mind visible screw heads) is to use some hex-head flanged woodscrews of sufficient length and screw the sleepers directly together with no ironwork. You can also use the damp-proof membrane between the soil and the sleepers.

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