I will be very interested to see what happens if Labour moves significantly to the left, for example under Corbyn. There seem to be two views on this: one says that if it happens Labour will be unelectable for a decade, like in the Michael Foot years, and the other says that if it happens Labour will come roaring back in with the popular support they've been lacking for some time.
I'm not sure which is which, especially as I'm not really a Labour voter. I'd be interested to see them try though. It would shake things up, and I think things need shaking up. British politics has for some time been frozen in the grip of a consensus that basically takes it as read that a certain set of things (capitalism, globalisation, EU membership, a certain level of welfare spending etc) are not up for discussion or challenge, and so the field on which politics can happen is quite a narrow one that's really just about tinkering round the edges. This contributes to the sense you get from, say, debates between Blairite Labour MPs and Cameroonite Tories that there's barely a gnat's crotchet between the parties.
What's interesting about figures such as Nigel Farage, and now Jeremy Corbyn, is that they're speaking for a growing body of people in the country who've been 'left behind' by the forces of globalisation etc and are now protesting that their voices aren't being heard and wanting to see things change. Corbyn and Farage might have different ideas about how to fix things (leave the EU, nationalise everything, whatever) but they speak for a significant and I think growing number of people. They're interesting because they do or say things that violate the unspoken consensus about the things it's ok to debate in politics, with predictably violent repercussions in the mainstream media. Witness the frothing recently in the Telegraph etc about some of the organisations Corbyn is believed to associate with, or the frothing last year about things Farage supposedly says or believes.
Increasingly, I think the big political debate isn't between Left and Right, but between the elitists (or technocrats, if you like - the ones in bed with big business and the global elite) and the populists - people who want to see popular politics, and populist ideas, having a voice in the political sphere.