Draft. "Primary" means the figure was read in an official text. The first four figures are sourced on the shop's measures page: https://sorrel-shop.pages.dev/measures/ . The Scots ell comes from the James I assize of weights and measures (APS vol. II, 1814), read as OCR and matched in Cochran-Patrick, Mediaeval Scotland (1892); the page image has not been checked.
The yard, inch and chain are defined in Part VI of Schedule 1 to the Weights and Measures Act 1985.
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