Rotten Borough

A rotten or pocket borough, more formally known as a nomination borough or proprietorial borough, was a parliamentary borough or constituency in England, Great Britain, or the United Kingdom before the Reform Act 1832, which had a very small electorate and could be used by a patron to gain unrepresentative influence within the unreformed House of Commons. The same terms were used for similar boroughs represented in the 18th-century Parliament of Ireland.

Old Sarum in Wiltshire (pictured) was the most notorious pocket borough. It was a possession of the Pitt family from the mid-17th century until 1802, and one of its Members of Parliament was Prime Minister William Pitt the Elder. In 1802 the Pitt family sold it for £60,000, even though the land and manorial rights were worth £700 a year (which would be equivalent to a capital sum of around £20,000) at most.

A parliamentary borough was a town which was incorporated under a royal charter, giving it the right to send two elected burgesses as Members of Parliament (MPs) to the House of Commons. It was not unusual for the physical boundary of the settlement to change as the town developed or contracted over time, for example due to changes in its trade and industry, so that the boundaries of the parliamentary borough and of the physical settlement were no longer the same.

For centuries, constituencies electing members to the House of Commons did not change to reflect population shifts, and in some places the number of electors became so few that they could be bribed by a single wealthy patron. In the 19th century, proponents of reform gave these boroughs the derogatory appellations "rotten boroughs" or "pocket boroughs", or more formally "nomination boroughs", because their democratic processes were rotten and their parliamentary member(s) were elected by the whim of the patron, thus "in his pocket"; the actual votes of the electors were a mere formality, all or a majority being willing to vote as the patron instructed them, with or without bribery. As voting was by show of hands at a single polling station at a single time, none dared to vote contrary to the instructions of the patron. Often only one candidate would be nominated (or two for a two-seat constituency), so that the election was uncontested.

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