First years in the Commons

In July 2007, Timpson was selected as the Conservative candidate for the Crewe and Nantwich constituency,^[13] an area which had been represented by the Labour MP Gwyneth Dunwoody since 1974. After Dunwoody died in April 2008, a by-election was called for May 2008. In the run-up to the by-election, Timpson was the target of a "toff" campaign by Labour, which attempted to paint him as "a rich man" who would not "understand the problems that people face day-to-day" in contrast to their candidate, Gwyneth Dunwoody's daughter Tamsin Dunwoody.^[9]

The Conservative campaign focused on local issues, such as crime and antisocial behaviour, closure of post offices and problems at Leighton Hospital, where two women in labour were turned away, as well as national issues - referring to Dunwoody as "Gordon Brown's candidate" and capitalising on dissatisfaction with the Labour government, in particular the removal of the 10% tax rate.^[14]

On 22 May 2008, Timpson was elected MP, gaining 20,539 votes (49% of the vote), a swing from Labour of 17.6%.^[15][16] This was the Conservatives' first gain in a by-election since 1982. He made his maiden speech in the House of Commons on 16 June 2008.^[17] Timpson served on the Joint Committee on Human Rights and the Children, Schools and Families Select Committee. He is a Vice-President of Conservative Friends of Poland.^[18]

2010 to 2017

Following his re-election on 7 May 2010, Timpson was appointed as Parliamentary Private Secretary of Theresa May, the Home Secretary. He was appointed as a Parliamentary Under-Secretary of State for Children and Families at the Department for Education in September 2012.

Timpson was named "Minister of the Year" in 2014 for pushing through reforms increasing the age of leaving foster care from 18 to 21, an initiative he had originally championed as a backbench committee chair.^[19] He credited his childhood experiences of living with a large family of fostered children.

He was re-elected in Crewe and Nantwich at the 2015 general election. On 11 May 2015, four days later, David Cameron announced he would become Minister of State for Children and Families at the Department for Education.

Timpson voted for Remain in the 2016 EU membership referendum.^[20]

He lost his seat at the 2017 general election by 48 votes after three recounts.^[21]

Work from 2017 to 2019

Timpson went on to write a review into education, looking at school exclusions, off-rolling and Special Educational Needs (SEN) students.^{[22][23][24][25]}

In 2018, Timpson was appointed as the chair of the Children and Family Court Advisory and Support Service (CAFCASS), for the term from April 2018 to April 2021, succeeding Baroness Tyler of Enfield.^[12]

Return to Parliament

Having lost his former seat of Crewe and Nantwich in 2017, Timpson was selected as the Conservative Party's candidate for the neighbouring seat Eddisbury in the 2019 general election. He defeated Antoinette Sandbach (formerly a Conservative MP who was suspended from the party and then defected to the Liberal Democrats).^[26] His former seat also went back to the Conservatives.

Following his appointment as Solicitor General for England and Wales in July 2022 he received the customary appointment as Queen's Counsel on 20 July 2022.^[27] As a result, he was the last QC to be appointed during the reign of Queen Elizabeth II.^[28]

Timpson announced in February 2022 that he would be stepping down at the next general election.^[29]