At the accession of George I Chippenham was an open borough, with the Whig and Tory interests fairly evenly balanced. In 1715 and 1727 ministerial supporters were returned, but in 1722 and 1734 the Government secured only one seat, which was lost at a by-election in 1737 to an opposition Whig, Edward Bayntun Rolt, of Spye Park, four miles from the town, an estate carrying with it the most important interest in the borough.
At the next general election great efforts were made by the Government to recover both seats. But in October 1740 Bayntun Rolt and Sir Edmund Thomas, the other opposition candidate, with several of their supporters, were made freemen,
in burgage holders
Number of voters: about 130
