The eldest child of Charles Lloyd Cadbury and Jillian Stafford Ransome,^[3] Cadbury belongs to a well-known Quaker family and is descended from the industrialist George Cadbury, of the Cadbury chocolate firm.^[4] She was privately educated at The Mount School, York, Bournville College, and the University of Salford, where she graduated BSc in social sciences in 1981.^[3]

From 1983 to 1989, Cadbury worked for the Covent Garden Community Association. She was then a Planning Advisor at Planning Aid for London for the next seven years, before beginning work as a Policy Planner at the London Borough of Richmond upon Thames for five years. She was a freelance planning consultant from 2006 to 2014.^[3][5]

Cadbury was first elected as a Labour councillor for the Gunnersbury ward of Hounslow London Borough Council in 1986, before being elected for the Brentford Clifden ward in 1998 and the Brentford ward in 2002. She was Deputy Leader of the Council from 2010 to 2012 and stood down as a councillor in May 2015.^[6]

At the 2015 general election, Cadbury defeated the sitting Conservative MP, Mary Macleod. In her maiden speech to the House of Commons on 2 June 2015, she referenced her Quaker background and its relevance to social justice.^[4] In December 2015, she voted against military intervention in Syria.^[7]

In October 2016, she was appointed by Labour Party leader Jeremy Corbyn as a Shadow Housing Minister.^[8] She supported Owen Smith in the failed attempt to replace Jeremy Corbyn in the 2016 Labour Party leadership election.^[9]

Cadbury was ousted 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.^[10][11]

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.^[12]

In 2019 Cadbury voted in favour of same-sex marriage and has consistently voted for equal gay rights. ^[13]

In the House of Commons she sits on the Transport Committee and previously sat on the Justice Committee and the Women and Equalities Committee.^[14]

Cadbury re-joined the Labour front bench in the May 2021 as the Shadow Minister for Planning, receiving half of Mike Amesbury's former brief as the Shadow Minister for Housing and Planning.^[15] 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.^[16]

Cadbury is a Quaker. She was one of three Quakers elected at the 2015 general election (the others being Labour's Catherine West and the Conservatives' Tania Mathias).^[17] In 2022, she became a Vice Chair of the All-Party Parliamentary Humanist Group, which meets to discuss issues of relevance to humanists.^[18]

She is an honorary associate of the National Secular Society.^[19] Cadbury is married to Nick Gash, a non-executive director of the Chelsea and Westminster NHS Foundation Trust^[20] and former chair of West Middlesex Hospital (Cadbury's constituency local hospital).^[21]

• Official website
• Profile at Parliament of the United Kingdom
• Contributions in Parliament at Hansard
• Voting record at Public Whip
• Record in Parliament at TheyWorkForYou
• Appearances on C-SPAN