At the
2017 general election, Largan unsuccessfully contested the
Bury South constituency for the Conservatives, where he finished second with 41.6% of the vote behind the incumbent
Labour Party MP
Ivan Lewis. In 2018, Largan unsuccessfully stood for selection in
Crewe and Nantwich. At the
2019 general election, Largan was elected as the Member of Parliament for
High Peak with a majority of 590 and with 45.9% of the vote. This is a bellwether seat that had been taken by Labour at the previous general election. On 2 March 2020, Largan was elected to serve on the Transport Select Committee to scrutinise the Department for Transport. In his role on the committee, he contributed to inquiries into various issues, including the impact of the coronavirus pandemic on the aviation sector and the rollout and safety of smart motorways. Largan gave his maiden speech on 23 March 2020, during an emergency debate on the Coronavirus Bill which introduced a range of new powers to tackle the Covid-19 pandemic. He used the speech to call on the Government to urgently provide more support to the self-employed. Largan also promised to take an independent-minded approach to politics, said he was "prepared to criticise [his] party and the Government when they get things wrong", and concluded his speech by saying "our greatest reforms—universal suffrage, civil liberties, the NHS—were secured not through ideological purity or confrontation, but by collaboration and taking the view that compromise is not betrayal but a kind of victory." Labour MP
Chris Bryant followed this speech by commending Largan's stance against ideological purity. After backing frontrunner
Rishi Sunak in the second Conservative leadership election, Largan was appointed Assistant Government Whip on 25 October 2022. In February 2023, Largan was re-selected as the Conservative candidate for High Peak at the
2024 general election. Largan was criticised in June 2024 for using banners on social media mimicking other political parties. In response,
Derbyshire Police confirmed that no electoral rules had been broken. He was beaten by Labour candidate
Jon Pearce in the
2024 general election. == Political beliefs ==