reformed so this increased the electorate only to 656 so Great Grimsby lost one of its two seats. However, Grimsby's population and housing continued to grow and, unlike most of the boroughs that lost one seat in 1832, it has retained its existence, without taking up large swathes of the county. The constituency underwent further significant boundary change in 1918 and 1950. In 1918, parishes that had joined, (Bradley, Great Coates, Little Coates, Laceby, Waltham, Weelsby and the adjoining neighbourhood/parish of Scartho) were detached to be added to Louth county constituency, and the seat consisted of the county borough of Grimsby and the urban district (later borough) of Cleethorpes. In 1950, Cleethorpes was moved into the Louth county division, leaving the borough once more as Grimsby alone. More recent boundary changes have only been adjustments to conform to changes at local government level. Labour's Austin Mitchell retained the seat in 1977 by only 520 votes in a by-election following the death of the Foreign Secretary Tony Crosland. He held the seat until retiring in 2015. At the 2010 election, Mitchell's majority was again reduced to three figures, after a swing of over 10% to the Conservatives. At the 2015 election, Great Grimsby was considered a target for the United Kingdom Independence Party (UKIP). UKIP had selected as their candidate the 2010 Conservative candidate, Victoria Ayling, who had switched parties since the previous election. Labour's candidate was Melanie Onn, while the Conservatives stood Marc Jones. In the event however, Onn was successful, increasing Mitchell's majority of 714 more than sixfold and enjoying a swing of 5.6% from the Conservatives, with UKIP finishing third, just 57 votes behind the Conservatives. The Conservative and UKIP votes combined outnumbered the Labour vote, which was an indication that the Labour position was potentially precarious. Similarly to many other traditionally working class Labour strongholds – labelled the "Red Wall" – in the North of England, in 2019, Great Grimsby was won by the Conservatives for the first time since 1935. Members of Parliament MPs 1295–1660 MPs 1660–1832 MPs since 1832 Elections Elections in the 2010s Elections in the 2000s Elections in the 1990s Elections in the 1980s Elections in the 1970s Elections in the 1960s Elections in the 1950s Elections in the 1940s Elections in the 1930s Elections in the 1920s Elections in the 1910s |colspan="6"|Due to the outbreak of the First World War, this election