Nadine Dorres did not get on with the new Prime Minister and Leader of the Conservative Party who is more of a manager than a leader with Conservative and Unionism principles and was instrumental in bringing down Boris Johnson to pave the way to getting the be the Leader without a vote of the membership of the Party:
Nadine Dorries resigns her seat as she accuses Sunak of ‘whipping a public frenzy against her’ (msn.com)
She could not continue with Parliamentary politics after being denied a peerage which she saw was conducted underhandly.
So a good Member of the Conservatives was finally shown the way out.
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Update of 30 August 2023
A new role for Nadine Dorries:
Nadine Dorries writes a book on the Plot to oust Boris Johnson ahead of Party Conference: