Margaret Thatcher was once asked what she considered her greatest achievement. She replied, "Tony Blair and New Labour. We forced our opponents to change their minds."
Labour's current desire to abstain on most of the Tories' welfare cuts is just one example of how true Thatcher's words were. Margaret Thatcher's success (and the fall of Communism, to be fair) made Tony Blair and most other Labour politicians believe that the only way forward was to change Labour into a carbon copy of the Tories. The result of this was that there was hardly any debate on a UK level on the alternatives to Conservative ideas until the SNP tsunami in May.
Now there are 56 SNP MPs, and this is already changing the debate in the House of Commons and within the Conservative government, as pointed out by James Forsyth:
The party’s Westminster leader Angus Robertson now has two goes each week at Prime Minister’s Questions. This might seem like a trivial detail but it is worth remembering how much of the No. 10 machine is geared towards readying the Prime Minister for his most important half hour in the Commons. George Osborne, Michael Gove and several of Cameron’s senior aides devote Wednesday mornings to helping him prepare for this appearance. ‘We’re having to take a lot more interest in the minutiae of Scottish politics than before,’ one of those involved in these prep sessions tells me.
Readying Cameron to face Robertson’s barbs means ensuring he is well-informed about events north of the border — about the SNP’s record at Holyrood. Slowly but surely, the Tory attack machine is turning its attention to being able to rubbish the governing record of the SNP as effectively as they trashed the last Labour government. One adviser in charge of this says that ‘for years, things have been hidden away in the Scottish Parliament. Now, they are moving front and centre.’
There are also many signs that Jeremy Corbyn is rapidly changing the debate within Labour. If he wins, there's a possibility that Thatcher's greatest achievement will be undone (unless, of course, the Blairites decide to split the party or commit some other form of collective harakiri).
Thoughtful right-wing politicians are starting to realise this. For instance, Tory councillor Oliver Cooper recently wrote this:
No matter how incredible or ludicrous, Corbyn would still have six questions at PMQs. His frontbench would still have a representative on Question Time and Newsnight. His party’s policy announcements and press releases would get just as much news coverage as a credible opposition.
In short, Labour being Labour, they’ll still have the same platform, no matter how bizarre their leader’s views. The only difference is Corbyn’s views will be more left-wing, so will shift the entire political debate to the left. Long-term, so long as Labour and the Conservatives remain the two major parties in the UK, the only way to make progress is to persuade Labour to accept our position. Our ideas don’t win just when our party does, but when the other party advocates our ideas, too.
Instead, a Corbyn victory would lend credibility to the far-left’s rejection of reality: giving a megaphone to their already over-blown and bombastic politics of fear and envy. Inevitably, this would skew the discourse, letting Corbyn’s ideas become the default alternative to the Conservatives. Corbyn’s brand of socialism would poison the groundwater of British politics for a generation: influencing people, particularly young people, across the political spectrum.
I don't agree with his characterisation of Corbyn's policies as a rejection of reality (I'd argue most Tories are much further removed from it in fact), but I think he makes a very good point about how it would undermine Conservative ideas (which would be great in my opinion).
The commentator Iain Martin is having similar concerns:
Just as the rise of UKIP has had an enormous impact on the British debate on Europe, forcing Cameron into a referendum he did not want as his party felt it needed to counter Farage, a distinct new Left movement would exert a gravitational pull on the centre-left more broadly and on the national conversation about taxation, ownership, profit and constitutional reform of the voting system and the House of Lords. The rise of Corbyn is already forcing terrified Labour moderates such as Andy Burnham to say all sorts of silly stuff.
Again, I wouldn't characterise Burnham's new-found principles as 'silly stuff', but otherwise it's a sound analysis.
If Jeremy Corbyn wins, the combination of a strong SNP and a left-wing Labour party might finally change the terms of the debate so that the Tories won't get the easy ride they've got used to recently. And once the debate changes, ordinary people might also start to question the neoliberal consensus.
This will be great in many respects, but I do fear that it could make Scottish independence less likely again, simply because it was the total disconnect between the political discourses in Scotland and Westminster that really fired up many Yes activists, so if UK Labour politicians start saying things we agree with, perhaps it will be harder to convince people that we need independence, even though Scotland will of course still only supply 10% of the MPs at Westminster.