From UKK41 is this interview on Sky between Ken Livingstone and Nigel Farage on the Euro. It's notable that Ken almost turns into a recruiting agent for UKIP, agreeing as he does with Nigel on many points.
One should be always careful with all things Ken and motives, although it's worth noting that Labour have historically had a better history of Euroscepticism than the Tories. What certainly seems true is momentum is building for at least one of the main parties to offer a referendum of sorts on our membership.
The only question left therefore is what's going to come first? A UK referendum or the collapse of the Euro?