Answer
What is the best way to build a Cotswold stone wall?
Local stone, a proper footing, the right batter, through-stones and a coping, in the traditional way.
In short
In the traditional way: sorted local stone, a proper footing, the right batter (the slight inward lean), through-stones for strength, and a coping on top, dry-laid or mortared to suit. Built that way it matches the local walls and lasts for generations.
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