In February 2024, Maguire was named as the Liberal Democrats' prospective parliamentary candidate for the North Cornwall.[2] At the 2024 general election, Maguire was elected to Parliament as MP for North Cornwall, receiving 47.8% of the vote and a majority of 10,767.[3] The incumbent Conservative MP was unseated with a vote swing of 24.9% towards Maguire.[4]
Ben Maguire was sworn in after making the parliamentary oath in Cornish.[5][6][7] On 15 July, Andrew George and Ben Maguire submitted a letter in support of Cornish devolution to the Prime Minister, Keir Starmer. Maguire described existing devolved responsibilities as window-dressing that did not go far enough. He also stated his support for a Cornish Assembly akin to the Welsh Senedd, and rejected the notion of a Mayor of Cornwall.[7][8]