Mayer is a member of the Labour Party's National Policy Forum, the GMB, UNISON and the Co-operative Party.
In the European Parliament she was Labour's spokesperson for the foreign affairs (16–18) and the economy (18–19)[4] and a member of the US-EU Relations Delegation. She is the international co-ordinator for the Washington DC Statehood campaign.[8]
A member of the Labour Animal Welfare Society, Alex is a long-standing animal welfare campaigner, she was awarded the Cruelty Free International Parliamentarian Award and took an 8 million signature petition to the United Nations in New York on the topic of animal free cosmetic testing.
Mayer has been a member of Amnesty International for over twenty years and worked on issues relating to the ongoing human rights abuses in Kashmir, as a member of the European Parliament Friends of Kashmir group.[9]
On 4 July 2024, Mayer won the Dunstable and Leighton Buzzard seat from the Conservatives by a margin of 667 votes (1.4%), becoming the area's first female MP.[3] She is the first Labour MP for the area in over 50 years since Labour's Gwilym Roberts won the South Bedfordshire constituency in 1966.[12]
In October 2024, Mayer urged the Government to change the process of Daylight Saving Time, by putting clocks one hour ahead of Greenwich Mean Time in winter and two hours ahead in summer, in what was described as a "fundamental shake-up of time" that would provide people with an extra hour of daylight for eleven months of the year; Mayer proposed calling the new timezone "Churchill Time" after Sir Winston Churchill, who introduced the same idea during World War Two.[13]
