This in itself doesn't guarantee it [a vote in the next Parliament], although of course if we got his onto the statute book and made it law then it's much harder for other parties to turn against it in the future.
And the Bill we have passed two years ago - the Act of 2011 now requires a referendum if any British government gives away more powers to the European Union now has been accepted by all the other parties.
More top news
Two ambulances crashed leaving one driver dead and three people seriously injured.
A scandal-hit NHS trust where a teenager drowned in the bath is still failing to protect patients from risk of harm, a watchdog has found.
New research suggests metal-on-metal hip replacements implanted since 2006 are more prone to failure and they "fail in a much nastier way".