Petition Make Election Manifestoes legally binding

The British electorate are always promised the earth in the run-up to a General Election, only to find that the promises never come to fruition.
All Election manifestoes should be a legally binding contract with the electorate. This would form the basis of the Opening of Parliament Speeches for several sessions, thus avoiding the sneaky surprises which are slipped in at present for which the electorate have not had an opportunity to consider. When the manifesto work has been completed the Parties should go to the country.
Emergency legislation should be the only deviation. If necessary, the electorate should have the opportunity of over riding contentious issues with Referendums.
Thus - less Presidential style Prime Ministers
It’s time politicians kept to their word.