According to an article in Guardian the Government is planning legislation that will allow couples who live together to have "divorce" rights. Harriet Harman told the Guardian that the law needs to be changed so people who live together are able to make the same claims as married couples after a relationship breakdown.
Besides the obvious question of "what's the point of marriage?", surely such proposals are going to be exposed to massive fraud? At least with marriage a gold-digger needs to make a significant legal commitment.