Polly Billington was elected Labour MP for East Thanet on 4 July 2024 with 17,054 votes (39.9 percent) and a majority of 6,971 (16.3 percent). The seat was open. Its previous occupant, Conservative Craig Mackinlay, had returned to Parliament in May 2024 after surviving sepsis that resulted in the amputation of both hands and both legs, only to announce the same day that he would not contest the election. Billington did not defeat a sitting Conservative. She inherited a constituency in grief and political transition.

Born in November 1967, Billington was educated at the University of Sussex. Her career before Parliament covered four distinct phases.

She began as a BBC broadcast journalist. She then became a special adviser to Ed Miliband from 2007, first in the Cabinet Office when Miliband was working on party policy and election strategy, then at the Department of Energy and Climate Change. She was the media director for Miliband's successful 2010 Labour leadership campaign. The Telegraph ranked her the 59th most influential person on the British left in 2011.

After leaving government she became Head of Communications and Campaigns at Citizens Advice, coordinating campaigns on energy, welfare and payday loans. In 2016 she founded UK100, a network of local government leaders committed to achieving clean energy targets. As CEO she built it into one of the most respected climate policy organisations in the UK. She won the Business Green Leader of the Year Award in 2023 for her "inspirational role in establishing UK100 as one of the most respected and important voices on climate policy." In 2023 she also took a senior adviser role at Hanover Communications, a lobbying and public affairs firm, in their election planning team.

She served as a Labour councillor in Hackney, London, standing down before her selection for East Thanet. She had previously contested a parliamentary seat in 2015 and lost.

BBC journalist, Miliband special adviser, Citizens Advice campaigns director, founder and CEO of a national climate organisation, Hackney councillor, Hanover Communications adviser: this is not a blank-sheet first-termer. She arrived in Parliament at 57 with more pre-parliamentary institutional experience than most of the 2024 intake combined.

Since entering Parliament she has sat on the Energy Security and Net Zero Committee (since October 2024), the Great British Energy Bill Committee (September to October 2024), and the Non-Domestic Rating (Multipliers and Private Schools) Bill Committee (December 2024). Her top debating partner is Ed Miliband, with 15 parliamentary interactions, reflecting the continuation of a professional relationship that began 17 years ago. She has contributed 1,966 words to the Non-Domestic Rating Act debate, 1,629 words on the Energy Social Tariff Bill, and 1,221 words on the Great British Energy Act. These are not backbench vanity speeches. They are contributions to bills within her area of genuine expertise.

East Thanet covers Ramsgate, Broadstairs and Margate. Reform UK took over 8,500 votes. The constituency combines coastal deprivation, seasonal tourism economies, health inequality, housing pressure and insecure work. Billington has framed coastal deprivation as a national policy problem rather than a local grievance, which is the right instinct for a constituency where the structural problems will not be solved by an individual MP's casework alone.

Billington's strengths include BBC journalistic training, a decade of working relationship with the current Energy Secretary, founding a nationally recognised climate policy organisation, the Energy Security and Net Zero Committee placement, substantial legislative debate contributions in her first year, and a 16.3 percent majority providing reasonable security. Her weaknesses include arriving via an open seat created by extraordinary personal circumstances (the Mackinlay sepsis), a Hackney councillor background that raises the parachute question for a Kent coastal seat, the Hanover Communications lobbying connection which may attract scrutiny, and a Reform UK vote exceeding 8,500 in a constituency where anti-establishment sentiment runs deep. At 58, she is unlikely to have a 30-year parliamentary career. The question is whether the climate and energy expertise translates into ministerial appointment or whether she remains an influential backbencher whose best work was done before she entered Parliament.