Labour leader Ed Miliband has tweeted:
21 years ago John Smith set out on the journey of One Member, One Vote. Today we have completed that journey. #OneNationPolitics
Now the battle to change our party is over. The fight for the future of Britain has just begun. #OneNationPolitics
More top news
China has put on its biggest display of military might in a parade to commemorate victory over Japan in World War Two.
Hungarian Prime Minister Viktor Orban is to meet with European Union leaders in Brussels today to discuss the migration crisis.
Drinkers subsidise non-drinkers by £6.5 billion a year, a report claims.