Doyle-Price stood unsuccessfully as the Conservative Party candidate for Sheffield Hillsborough in the 2005 general election, coming third with 15.02% of the vote. Doyle-Price was elected for the Conservative Party as the Member of Parliament for Thurrock at the 2010 general election, by a majority of 92 after two recounts. She retained her seat in May 2015, with a majority of 536 after a recount and in June 2017 with a majority of 345. Doyle-Price made her maiden speech on 28 June 2010, speaking about the need for welfare reform. She was prepared to publicly challenge ministers on behalf of her constituents, particularly on transport issues connected with the Dartford Crossing and on the Government postponement of work to improve Junction 30 of the M25. In June 2010, she was appointed to the House of Commons which is responsible for scrutinising Government spending and whether it is delivering value for money. In May 2012 she was elected Chairman of the All Party Gurkha Welfare Group. In the 2010 parliament, Doyle-Price was a member of "the forty" – the forty Conservative MPs with the smallest majorities. In 2012, she was named by Conservative Home as one of a minority of loyal Conservative backbench MPs not to have voted against the government in any significant rebellions. In 2013, Doyle-Price voted both for and against allow same-sex marriage in England and abstained in extend it to Northern Ireland in 2019. Following the success of UKIP in the 2013 local elections, she said: "To see Parliamentary colleagues who are calling for an ever closer association with UKIP is exasperating for those of us who are at the coalface in the fight against Labour to secure a majority for the Conservative Party". Doyle-Price was a co-sponsor of the private member's EU membership referendum bill that was given a second reading on 5 July 2013. On 14 January 2014, she led a debate in Westminster Hall on options for the new Lower Thames Crossing. Doyle-Price was opposed to Brexit prior to the 2016 EU membership referendum. In the House of Commons she has sat on the Public Accounts Committee and Committee of Selection.
Government appointment
Following the 2015 general election, Doyle-Price was appointed as an assistant whip. On 2 December 2015 she was one of the tellers for the "Ayes" and on 1 February 2017 she was the government teller who announced the result of the vote to trigger Article 50 of the Lisbon treaty. Following the 2017 election she was appointed Parliamentary Under Secretary of State in the Department for Health. In July 2017, she spoke in parliament in her new role, answering a question from a DUP "shadow". In October 2018, she was appointed as Minister for Suicide Prevention and Mental Health, a new position in the Department of Health and Social Care, and co-chaired the Women's Mental Health Taskforce. It had emerged that Doyle-Price had joked in an article to a local newspaper about preferring to "Jump off Beachy Head" than defect to UKIP. She left the government following the election of Boris Johnson as leader of the Conservative Party.
Partner Employment
Doyle-Price employs her partner Mark Coxshall as her part-time Office Manager on a salary up to £30,000. The practice of MPs employing family members has been criticised by some sections of the media on the lines that it promotes nepotism. Although MPs who were first elected in 2017 have been banned from employing family members, the restriction is not retrospective – meaning that Doyle-Price's employment of her partner is lawful. Coxshall, who has been a Conservative Party Councillor in Thurrock since 2010, was investigated in August 2013 by the Police for allegedly 'racist' comments made about travellers; he denied the allegations and was not subsequently prosecuted. In January 2015, he was criticised by rival councillors for swearing on several occasions in formal council meetings, whilst his lack of appearances at meetings of the Essex Fire Authority was criticised in March 2016.
LGBT+ Rights
On 14 May 2020, Doyle-Price was criticised by the LGBT Foundation for "inflammatory and discriminatory" remarks against Transgender people. On 16 May 2020, she accused the Liberal Democrats of being paid by Pharmaceutical companies to promote Trans Rights.
