At the
2015 general election, Cadbury was elected to Parliament as MP for
Brentford and Isleworth with 43.8% of the vote and a majority of 465. In her
maiden speech to the
House of Commons on 2 June 2015, she referenced her Quaker background and its relevance to social justice. In December 2015, she voted against military intervention in Syria. In October 2016, she was appointed by
Labour Party leader Jeremy Corbyn as a Shadow Housing Minister. She supported
Owen Smith in the failed attempt to replace
Jeremy Corbyn in the
2016 Labour leadership election. At the snap
2017 general election, Cadbury was re-elected as MP for Brentford and Isleworth with an increased vote share of 57.4% and an increased majority of 12,182. Cadbury was dismissed as Shadow Housing Minister on 29 June 2017 for contravening a
whipped vote on an amendment to the
Queen's speech calling for the UK to remain in the
European Single Market; whilst the Labour position was to abstain, she voted to support the motion. She voted in the unsuccessful no ('Noes') lobby in a key House of Commons division of 25 June 2018 for the National Policy Statement on Airports, which laid out government support for a third runway, and she was among 28 of the 46 London Labour MPs opposing the runway. At the
2019 general election, Cadbury was again re-elected, with a decreased vote share of 50.2% and a decreased majority of 10,514. Cadbury re-joined the Labour front bench in May 2021 as the Shadow Minister for Planning, receiving half of
Mike Amesbury's former brief as the Shadow Minister for Housing and Planning. In Keir Starmer's front bench reshuffle of November 2021, Cadbury was appointed Shadow Trade Minister. In his reshuffle in
September 2023, she was appointed Shadow Minister for Prisons, Parole and Probation. At the
2024 general election, Cadbury was again re-elected with a decreased vote share of 44.2% and a decreased majority of 9,824. In September 2024 she was elected as Chair of the Commons Transport Select Committee. Cadbury is a co-sponsor of
Kim Leadbeater's
Terminally Ill Adults (End of Life) Bill on
assisted suicide. == Personal life ==