There were never enough voters to avoid the risk of corruption, and systematic bribery generally prevailed, with anything up to 150 votes being bought and sold at any one election.
[2]) By the 19th century Wallingford was regarded as one of the worst of the rotten boroughs, and Oldfield recorded in 1816 that the price of a vote was 40 guineas.
Under the Reform Act 1832, the constituency was allowed to survive and to keep one of its two MPs, but the boundaries were considerably extended, taking in the Wallingford Castle precincts, which had previously been excluded, and all or part of a dozen neighbouring parishes including Benson and Crowmarsh, and part of Cholsey.
In 1868 the franchise was further extended and there were 942 registered electors, but the constituency was much too small to survive the Third Reform Act, and was abolished with effect from the general election of 1885.
Where there was more than one candidate, in one or both successive elections for the same number of seats, then change is calculated on the individual percentage vote.