"If the Labour party shifts in a direction which is extreme and not liberal, or even less liberal than it is now, we will be a home for Liberals wherever they're from," said Farron.

"The great concern is that the Labour party looks to be in the position where it's not doing any opposing at all, and the opposing it might end up doing could be of an irrational and unelectable nature. The Tory party will be in power forever if there isn't a proper electable, credible alternative, and we're happy to be that."