trexSay what you like about the Tories from a policy perspective – like, they exist to protect the interests of the powerful, to redistribute wealth to the rich, etc – but their strategic prowess is frankly extraordinary.

Throughout the 20th century they were renowned as the “best election-winning machine in Western Europe”, and indeed after the Attlee government they were only ejected from office three times by Labour: 64, 74 & 97.

Blair’s three wins led to smug conclusions from the centre and left that the Tories had lost their magic touch. But everyone has an off decade from time to time, and besides (again, say what you like about him in policy terms) Blair was the master of his medium.

The Tories are back, though, and they appear to have developed a new art, or refined an old one: a trick which should give any party considering working with them good reason to think twice about it. They have become very adept at destroying their partners, and it is no mere coincidence. They know exactly what they’re doing as they do it.

First, the Lib Dems. It’s reported that, just after the coalition deal was inked, William Hague said “I think I’ve killed the Liberal Democrats“, and history has proved him right. Clegg’s spectacularly inept approach to the 2010 hung Parliament – and, prior to that, the supremacy within the party of the Orange Book brigade – meant they gleefully signed up to a Tory programme of government where very little was moderated and which John Major or even early Maggie might have regarded as too extreme.

In fact, sometimes I wondered whether the Tories pushed the Coalition’s agenda even to the right of where they wanted to be, primarily to destroy the Lib Dems. That’s a long-term aim I know many in other parties have had vaguely in mind. But no-one else could have carried it out so expertly.

What I hadn’t seen, which was hiding in plain sight, was the way in which this project would be used to deliver a Tory majority. My bet on them to win overall was a mere hunch, based on a lack of faith in the electoral system, not on good analysis of what they were up to. What the Tories worked out (and handed to Crosby to deliver) was that if they could hold Labour to a draw in England and crush the Lib Dems across the south, especially in the south-west, they could potentially convert a comfortable combined majority into a narrow one-party majority.

It’s a moment of strategic genius, and it worked perfectly. To sit chummily with the Lib Dems for five years, to let them hand you power, and all along to plan to take their seats off them by way of a thank-you: it’s cold, brutal, impressive. Last time, with the National Liberal Party, the Liberals would eventually come back. It’s unclear whether the Lib Dems will.

But to pull off two such manoeuvres in one electoral cycle is truly extraordinary, and that’s what they’ve done. The other victims were Labour, both in England and in Scotland. Scotland wasn’t designed as direct help, i.e. to provide any more Tory wins, more as a way of making Labour’s life more difficult in the event of an anti-Tory majority. But it was done the same way. Like a mafia don at the height of his powers, they kept their enemies closer.

In the case of Labour, the independence referendum was the perfect opportunity to do just that. It couldn’t have been a closer embrace: they effectively subsumed all three unionist parties into Better Together, and killed Labour with apparent affection. The Tories know how the left two thirds of Scotland see them, and they saw the opportunity to let that rub off on Labour. In fact, the aim was not just to drag Labour down with them, but in fact make Labour more hated in Scotland than the Tories. It worked a treat: remember the surprise when polls showed Cameron was less unpopular in Scotland than Miliband.

It’s the same trick as with the Lib Dems. Tory voters got mostly what they wanted out of coalition – and no-one else was surprised, that’s just how Tories are. Ditto with the independence referendum. Everyone expects the Tories to be in favour of the status quo, so they didn’t lose any credibility – in fact Ruth Davidson accrued more through a matey profile – but the way Labour worked hand-in-glove with the Tories immediately put the former people’s party squarely in the role of Betrayers of Scotland.

And again, they knew what they were doing: I bumped into a Tory MSP of my acquaintance as the post-indyref surge in SNP membership was underway after Johann Lamont’s resignation. I’ve never seen him so cheery, and he declared: “we’ve managed to make Labour look like the party of Scotland in England, and to look like the party of Westminster in Scotland”. It’s a brutal vice to squeeze them in, and I admit I only really thought about the implications for Scotland, i.e. the likelihood that Labour would take a drubbing in the election just past. I’ve been sceptical of the impact the “fear of Scotland/the SNP” message had on English votes, especially given how popular Nicola was in England after the first debate, but this fits alongside it nicely. The Tories clearly had a plan. And again, Labour helped them by endlessly trying to demonise a party which broadly occupies the same space as them on the spectrum. Every time Ed tried even more desperately to distance himself from the SNP it just helped the Tories… and the SNP. It’s the old LBJ anecdote: “I wanna hear him deny it.. on TV!”

To dip back to the Lib Dem example, the poor fools thought they could “take credit” for some of the coalition’s changes in this election, such as the surprisingly regressive personal allowance changes, and for even more absurd wins, such as things that might hypothetically have happened without them restraining the evil Tories. This too has a parallel. Scottish Labour really thought they were using Tory money to support Labour when in fact they were digging their own political graves through Better Together.

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Obviously, in Scotland the Tories’ objectives were shared with the single-minded SNP, who squeezed both Labour and the Lib Dems almost off the board. None of this is to deny the skill with which the SNP have parlayed a programme quite similar to Labour’s into a generational shift in their own favour. But this stunning SNP success was essentially a full-frontal assault, aided by Labour’s indyref mistakes, and feels like a blunt instrument compared to the Tory moves.

I’m not sure what the Tories are up to with UKIP, but it seems certain it involves looking Eurosceptic and staying in the EU, possibly even getting pro-business concessions that will make the left very uncomfortable about being on the Stay In side alongside him. Alternatively (unless Farage completes their self-destruction in time) Cameron might come back from Brussels, declare he didn’t get quite enough concessions, and end up on the same (presumably losing) side as UKIP, making them seem doubly irrelevant but uniting his party in the process. “Losing” gracefully would shut up the “bastards” and UKIP and make the Tories even safer for business. To be honest, I don’t see the threats to him either way, and whatever they’re up to I wouldn’t bet against them.

This return to strategic form by the Tories is sadly not just of academic interest. Anyone who wants to beat them needs to outsmart them (which is not the same as tacking right to meet them). And anyone considering working with them should take a quick step backwards, too, so long as they’re sure they know which direction the cliff is in.