Heidi Suzanne Allen (née Bancroft; born 18 January 1975)[1] is a British businesswoman and former politician who served as the Member of Parliament (MP) for South Cambridgeshire from 2015 to 2019.

She attended Wakefield Girls' High School, before receiving a BSc degree in astrophysics from University College London (1993–1996).

[6] In February 2014, Allen ran in an open selection process for the South East Cambridgeshire parliamentary constituency Conservative Party candidacy.

[12] Allen made her maiden speech before the House of Commons on 20 October 2015, when she detailed criticism of proposed cuts to tax credits, saying, "because today I can sit on my hands no longer".

[23] In December 2017, Allen was tearful during a House of Commons debate on Universal Credit after hearing fellow MP, Frank Field, describe how he had talked a man out of suicide.

She stated: "I was ill when I made the incredibly hard decision to have a termination: I was having seizures every day, I wasn't even able to control my own body, let alone care for a new life...

[30] In August 2019, a pro-Brexit former Royal Marine was jailed for 24 weeks after threatening Allen online, including posting aerial images of her home on social media.

[31] On 20 February 2019, Allen, along with Anna Soubry and Sarah Wollaston, resigned from the Conservative Party to join The Independent Group, later Change UK.

[33] In May 2019, Allen threatened to resign as leader during an internal party row about whether Change UK should back the Liberal Democrats in some regions at the European elections.

[36] On 7 October 2019, it was announced that Allen had joined the Liberal Democrats and would initially stand for the party in her South Cambridgeshire constituency at the next election.

She mused that Clegg would be her first choice to go into her fantasy cabinet as Deputy PM if she ever became prime minister; she later stated that she is too emotional to ever fill that role.