Natalie Bennett, the leader of the Green party, told BuzzFeed News she believes her party will overtake the Liberal Democrats in time for next year's general election, and "blow British politics wide open".

"There's a trend," she explained in the very Green party setting of an organic juice and smoothie bar. "The Lib Dems are going down and we're going up. Before the election, we will take over."

These are bold words, coming from the leader of a party the BBC and Sky News haven't bothered to invite to the general election TV debates, but as Bennett happily explained, the Greens are enjoying a bit of a surge at the moment.

In only the last five days, 1,000 new members have joined. So far this year, membership has risen by 64%. On top of that, a recent poll put their support at a new high of 8% – above the Lib Dems.