How will David Cameron's replacement be chosen?
The winner will become not only leader of the Conservative Party but also prime minister of the country.
Names of potential contenders are being submitted from today and nominations will close tomorrow at noon.
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Hide AdContenders just need to be proposed by two fellow party MPs.
If there are more than two candidates on the shortlist then a series of secret ballot contests will be held where the 331 Tory MPs whittle it down to just two.
Then hustings will be held across the country with Tory party members voting for their favourite in a postal ballot.
The winner should be announced by September 2 and in place before the party conference in October.