To date, 90 out of 650 MPs have opted out of the next race, including 14 ex-secretaries of state and 9 committee chairs predominantly from the Conservative Party, resulting in their most substantial exodus since 1997.

Prominent figures like Sajid Javid, Ben Wallace, and Dominic Raab are stepping aside, along with 11 Conservative ex-secretaries with 40 years of collective cabinet experience. This departure raises concerns about the party's future expertise, especially in foreign affairs.

Conservative stalwarts such as Nick Gibb and Tracey Crouch, and Graham Brady, chair of the influential 1922 Committee, are also retiring. Labour is losing veterans like Harriet Harman and Margaret Beckett, with Nick Brown also stepping aside amidst an internal investigation.

Many Tories, influenced by Labour's lead in the polls and the party's long tenure in power, are contemplating their post-political lives.

The past decade has been politically demanding, with several pivotal elections and the Brexit referendum. The Institute for Government's Philip Nye notes that numerous big names are leaving, which will result in a significant loss of experience in Parliament.

Boundary changes are also a factor, prompting some MPs to seek new constituencies or retire, like Jonathan Djanogly. Challenges including threats and the intense demands on personal lives are additional reasons cited for stepping down.