There was a dip in the carriage of merchandise in 1810, when the Kennet and Avon Canal opened and provided a more convenient route from Bristol to London, but it picked up again after 1819, when the North Wilts Canal opened, providing a link from Latton to Abingdon via Swindon and the Wilts and Berks Canal, which was easier than using the Thames.
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The plan was led by Dallaway's son William, who asked Thomas Dadford, Jr., the engineer on the Staffordshire and Worcestershire Canal and John Priddy, who had been the engineer on the Droitwich Canal during its construction, to carry out a survey.
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John Dallaway, who had been appointed as a commissioner under the 1730 Act, commissioned the engineer Thomas Yeoman to make a new survey in 1754, and his new plan was published the following year.
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