The results of the Second Periodical Review, concluded in 1969, and a subsequent interim review, concluded in 1972, of the Boundary Commission for Scotland, became effective for the February 1974 general election of the House of Commons of the Parliament of the United Kingdom (Westminster). The reviews defined 29 burgh constituencies (BCs) and 42 county constituencies (CCs), with each electing one Member of Parliament (MP) by the first past the post system of election. Therefore, Scotland had 71 parliamentary seats.