district as well as the town of Warsop in the Mansfield district (see list of wards during this period below). There were no boundary changes in 1997. From 1983 to 2010, the constituency comprised the following Bassetlaw district wards: Beckingham, Blyth, Carlton, Clayworth, Everton, Harworth East, Harworth West, Hodsock, Misterton, Rampton, Ranskill, Sturton, Sutton, Welbeck, Worksop East, Worksop North, Worksop North East, Worksop North West, Worksop South, Worksop South East along with two Mansfield district wards: Birklands, Meden (both in the Warsop area). These wards were transferred to Mansfield constituency in 2010. Bassetlaw constituency boundaries, shown within the county of Nottinghamshire Electoral history On a historical measure, this had been a very safe seat for the Labour Party before 2019, with their own or related candidates having held it since the 1929 general election. On a size-of-majority measure, it was a low to medium safe seat. Its first Member of Parliament Malcolm MacDonald was one of the few Labour MPs to join his father Ramsay MacDonald's National Government. MacDonald held the seat as a National Labour candidate in the 1931 election, but was defeated at the next election in 1935 by Labour's Frederick Bellenger. Bellenger held the seat until he died in 1968. A by-election followed. The seat was retained for the Labour Party by Joe Ashton with a slender 1.72% majority, the narrowest since the 1920s. He held the seat until retirement at the 2001 general election. He was succeeded at that year's election by fellow Labour politician John Mann, who retained the seat at the next four elections. In 2019, Mann resigned being having been appointed to head a government inquiry on tackling anti-Semitism and to take a seat in the House of Lords. The Labour candidate initially chosen to replace Mann, Sally Gimson, was deselected before the election by the party's National Executive Committee over what were described as "very serious allegations". Gimson referred to the process as a "kangaroo court", and Mann called the decision a stitch-up; Gimson started legal action against the party, but dropped the case several days later. Keir Morrison, a councillor in the Ashfield District, replaced Gimson as the Labour candidate. In the December 2019 general election, the Conservatives won the seat with a swing from Labour of 18.4%, the largest recorded in the election. The fall in Labour's vote, 24.9%, was the greatest of any seat in the election. Members of