Speaking this morning ahead of further debate on the European Union (Amendment) Bill, Liberal Democrat leader Nick Clegg said:

"The debate over Britain's future in Europe has been poisoned for too long by a Labour Party that refuses to make the case for it, and an opportunistic Tory Party that actively seeks to undermine it.

We need to draw the poison from that debate - to settle the matter one way or another.

So today I am inviting the Labour and Conservative parties to join with me in calling for the referendum that will settle Britain's European future, once and for all: an in-out referendum."