Lillian Jones was elected Scottish Labour MP for Kilmarnock and Loudoun on 4 July 2024 with 19,055 votes (44.8 percent) and a majority of 5,119 (12.1 percent), defeating Alan Brown who had held the seat for the SNP since 2015. Before entering Parliament she spent 17 years as an NHS clinical support worker at NHS Greater Glasgow and Clyde. She served simultaneously as an East Ayrshire councillor for 12 years. Her background was not only local government but also frontline NHS work.

Jones was elected to East Ayrshire Council for the Kilmarnock West and Crosshouse ward in May 2012 and served until her resignation on 2 September 2024. Over 12 years she chaired the Governance and Scrutiny Committee, a role overseeing the council's decision-making processes and accountability. She worked as an NHS clinical support worker throughout her council service, balancing a dual career in public health and local government that is unusual among MPs. She held the NHS role until 7 July 2024, three days after her election.

Kilmarnock and Loudoun was Labour territory from 1983 to 2015 before Alan Brown took it for the SNP during the post-referendum surge. Jones reclaimed it with a comfortable margin. The Conservative candidate received 3,537 votes (8.3 percent) and Reform UK took 3,472 (8.2 percent). Brown subsequently won the Kilmarnock and Irvine Valley seat at the May 2026 Scottish Parliament elections, confirming his continued political presence in the area.

Since entering Parliament, Jones has been appointed to the Scottish Affairs Committee and the Finance Committee. She has voted in more than 290 divisions. Her divergences from the party have come overwhelmingly on the Terminally Ill Adults (End of Life) Bill, a free vote on which she repeatedly opposed the majority of her colleagues, and she also rebelled on the Universal Credit and Personal Independence Payment Bill in July 2025, voting for an amendment against the government's welfare reforms. These votes show she is prepared to break with her colleagues when she disagrees. She contributed 439 words to the Tobacco and Vapes Bill debate.

Her constituency covers Kilmarnock, Auchinleck, Stewarton, Dunlop and Kilmaurs in East Ayrshire. It is a mixture of the post-industrial town, former mining communities and agricultural Ayrshire. Economic deprivation, healthcare access and local services are the dominant constituency concerns.

Jones's strengths include 17 years of NHS clinical experience providing genuine health service knowledge from the frontline rather than from management, 12 years as a councillor demonstrating sustained commitment to local public service, committee appointments on Scottish Affairs and Finance within her first year, and a 12.1 percent majority that gives reasonable security in a constituency with volatile recent history. Her weaknesses include limited national visibility, a parliamentary record still being built, and the standard first-term absence of ministerial office. At an age not publicly recorded, she is an MP whose pre-parliamentary career was defined by doing two demanding public service jobs simultaneously for over a decade. That dual public-service record is a stronger foundation than most first-term MPs bring.