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David Cameron is proposing that anyone who takes over as prime minister mid way through a Parliament would have to hold an election within six months.The Conservative leader has been a critic of the way Gordon Brown took over from Tony Blair and spent three years as PM without an election.
John Major and Jim Callaghan also both took over as PM outside of elections.
After unveiling his political reform plans Mr Cameron is due to attend his 38-year-old sister Clare's wedding.
Miss Cameron, who introduced her brother to his future wife Samantha on a family holiday, is to marry market research executive Jeremy Fawcus at a private ceremony in southern England.
'Postal primaries'
Before taking a break for the wedding, Mr Cameron is staging a campaign event in Essex focusing on political reform plans.
The key element is the proposal that anyone taking over as PM following the death, overthrow or resignation of the previous incumbent would have to call an election within six months.
A new PM would be free to request a dissolution at any time during the six-month period, which would allow time for him or her to appoint a ministerial team and set out a programme for government and for Parliament to deal with any outstanding business, under the plans.
Mr Cameron will also unveil plans to provide state funding for 200 all-postal primaries across the country over the course of the next Parliament at a total cost of about £8m.
The money - which would come from cutting the amount spent on the Electoral Commission - would be divided up according to the share of the vote parties had in the general election.
Parties would decide which constituencies they want to hold open primaries in, select four or five candidates and then send ballot papers to all registered voters - regardless of whether or not they back that party - for them to select their election candidate.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.