The opportunities for Cameron and Clegg in Eastleigh are as great as the dangers

Clegg has a chance to prove the Lib Dems won't be wiped out in 2015 and Cameron a chance to show how the Tories could win a majority.

The resignation of Chris Huhne as an MP heralds perhaps the most politically interesting by-election of this parliament. His Eastleigh constituency, just outside Southampton, is that most intriguing thing: a coalition marginal. His majority in 2010 was 3,864 over the Conservatives, with Labour a distant third. While the Guardian's Jonathan Freedland yesterday, set out the "problem for all parties" this by-election poses, it also presents some great opportunities.

Ipsos MORI’s latest poll in January had support for the Liberal Democrats at the lowest level recorded since 1990, on just eight per cent, with UKIP on nine per cent, the highest rating we have ever recorded.  At the other end, Labour had a 13-point lead over the Conservatives. Of course, this is the national picture and locally things can be very different, but it does illustrate the low ebb from which the Liberal Democrats will begin the by-election campaign.

This will be the first time since the formation of the coalition that the two parties will seriously do battle against each other for a Westminster seat. It may well prove a dry run for the general election as we get to see just how the two governing parties will set out their stalls. 

The Lib Dems have held Eastleigh since 1994 when they took the seat from the Conservatives in, appropriately enough, a by-election. At the four general elections since then, the Liberal Democrat majority over the Conservatives has never been more than 4,000. It was high on the Conservatives’ list of target seats in 2010 and will be again in 2015.

The opportunity then presents itself for the Tories to show that they can win seats from the Lib Dems at the next general election. If David Cameron and his party are to win a majority, it is seats like Eastleigh that will need to turn blue. The spoils of victory would bring a much-needed morale boost to the party and help to settle recent rumours of challenges to Cameron's leadership. 

The opportunity for the Lib Dems is also great. Winning a closely fought by-election against the Conservatives would be a huge boon to a party apparently struggling so badly in the polls. It would provide a shot in the arm for members, activists and their leaders. Nick Clegg and his team would have proved that the Liberal Democrats have not been wiped out by forming a coalition with the Conservatives and that they can hold seats at the general election.

For Ed Miliband and Labour the temptation must be to sit back, save valuable resources and watch the Tories and the Lib Dems tie themselves in knots campaigning against each other.

Since the 1994 by-election, when Labour came second, they have been less and less competitive in Eastleigh. In 2010, they won just 9.6 per cent of the vote (compared to the Liberal Democrats’ 46.5 per cent). However, think what a good performance, however unlikely, could do for Labour. Even coming second, as they did in 1994, would surely have Conservative and Liberal Democrat strategists staring at the 2015 drawing board. Miliband, a leader who has not quite convinced his own party's voters yet (only 53 per cent of Labour supporters are satisfied with his leadership compared to 75 per cent of Conservatives for Cameron), would show Labour has gained ground in areas where it was previously uncompetitive. 

In that 1994 by-election a little known Nigel Farage won just 169 more votes than Screaming Lord Sutch. Farage, now leader of UKIP, is being described as the "wildcard" in the 2013 by-election and will undoubtedly have a bigger impact on the results this time around.

But the UKIP leader has yet to decide whether he will run. The perils are obvious, if he runs and loses heavily it would slam the brakes on the momentum he and his party have been building over the last few years. A successful campaign – which does not necessarily just mean victory – would, by contrast, put further wind in the UKIP sails ahead of the general election. Farage may decide the personal risk is too great but still fully back another UKIP candidate. The opportunity for UKIP is to demonstrate that they remain a growing force in British politics.

The prospect of a strong UKIP campaign adds another dimension to the race, and allows political watchers to see the effect it can have on the other parties. We know that 43 per cent of UKIP voters voted for the Conservatives in 2010. So, will UKIP be successful in persuading Conservatives to actually vote for them and in large enough numbers to impact on the result? It is also the first electoral test for the Tories since Cameron’s promise of an in/out EU referendum. How will that impact on UKIP’s support, and what they campaign on? A damp squib of an election for UKIP could well vindicate Cameron’s decision to make the pledge.

In 2010, UKIP won just 3.6 per cent of the vote, but by-elections are unusual and can produce surprise results. Would George Galloway have won in Bradford West last year had it been a general election? Probably not, and it does not necessarily point to further success for the Respect Party in 2015. All of which throws up the prospect of another "unusual" result in Eastleigh which tells us nothing about the next general election.

This by-election is different though. It may not tell us who will win the general election but it will help to shape the narrative for all the parties, either inflating or deflating their political balloons, however temporarily. It will also give us a glimpse into some of the more intriguing aspects of 2015: how will the coalition parties fight each other? What impact will UKIP have on the outcome? Fortune though, favours the brave. There is a great deal to be won in Eastleigh for those who want it.

N.B. It is worth noting that this by-election came about because Chris Huhne asked his wife to take his speeding points; in 2006, 12 per cent of UK drivers said they would ask a friend of relative to take speeding points for them if they were facing a ban. 

Tom Mludzinski is deputy head of politics at Ipsos MORI

For the first time since the coalition was formed, the governing parties will do battle in a Lib Dem-Tory marginal. Photograph: Getty Images.

Tom Mludzinski (@tom_ComRes) is head of political polling at ComRes

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Former Irish premier John Bruton on Brexit: "Britain should pay for our border checks"

The former Taoiseach says Brexit has been interpreted as "a profoundly unfriendly act"

At Kapıkule, on the Turkish border with Bulgaria, the queue of lorries awaiting clearance to enter European Union territory can extend as long as 17km. Despite Turkey’s customs union for goods with the bloc, hauliers can spend up to 30 hours clearing a series of demanding administrative hoops. This is the nightmare keeping former Irish premier John Bruton up at night. Only this time, it's the post-Brexit border between Northern Ireland and the Republic, and it's much, much worse.   

Bruton (pictured below), Taoiseach between 1994 and 1997, is an ardent pro-European and was historically so sympathetic to Britain that, while in office, he was pilloried as "John Unionist" by his rivals. But he believes, should she continue her push for a hard Brexit, that Theresa May's promise for a “seamless, frictionless border” is unattainable. 

"A good example of the sort of thing that might arise is what’s happening on the Turkish-Bulgarian border," the former leader of Ireland's centre-right Fine Gael party told me. “The situation would be more severe in Ireland, because the UK proposes to leave the customs union as well."

The outlook for Ireland looks grim – and a world away from the dynamism of the Celtic Tiger days Bruton’s coalition government helped usher in. “There will be all sorts of problems," he said. "Separate permits for truck drivers operating across two jurisdictions, people having to pay for the right to use foreign roads, and a whole range of other issues.” 

Last week, an anti-Brexit protest on the border in Killeen, County Louth, saw mock customs checks bring traffic to a near standstill. But, so far, the discussion around what the future looks like for the 260 border crossings has focused predominantly on its potential effects on Ulster’s fragile peace. Last week Bruton’s successor as Taoiseach, Bertie Ahern, warned “any sort of physical border” would be “bad for the peace process”. 

Bruton does not disagree, and is concerned by what the UK’s withdrawal from the European Convention on Human Rights might mean for the Good Friday Agreement. But he believes the preoccupation with the legacy of violence has distracted British policymakers from the potentially devastating economic impact of Brexit. “I don’t believe that any serious thought was given to the wider impact on the economy of the two islands as a whole," he said. 

The collapse in the pound has already hit Irish exporters, for whom British sales are worth £15bn. Businesses that work across the border could yet face the crippling expense of duplicating their operations after the UK leaves the customs union and single market. This, he says, will “radically disturb” Ireland’s agriculture and food-processing industries – 55 per cent of whose products are sold to the UK. A transitional deal will "anaesthetise" people to the real impact, he says, but when it comes, it will be a more seismic change than many in London are expecting. He even believes it would be “logical” for the UK to cover the Irish government’s costs as it builds new infrastructure and employs new customs officials to deal with the new reality.

Despite his past support for Britain, the government's push for a hard Brexit has clearly tested Bruton's patience. “We’re attempting to unravel more than 40 years of joint work, joint rule-making, to create the largest multinational market in the world," he said. It is not just Bruton who is frustrated. The British decision to "tear that up", he said, "is regarded, particularly by people in Ireland, as a profoundly unfriendly act towards neighbours".

Nor does he think Leave campaigners, among them the former Northern Ireland secretary Theresa Villiers, gave due attention to the issue during the campaign. “The assurances that were given were of the nature of: ‘Well, it’ll be alright on the night!’," he said. "As if the Brexit advocates were in a position to give any assurances on that point.” 

Indeed, some of the more blimpish elements of the British right believe Ireland, wedded to its low corporate tax rates and east-west trade, would sooner follow its neighbour out of the EU than endure the disruption. Recent polling shows they are likely mistaken: some 80 per cent of Irish voters say they would vote to remain in an EU referendum.

Irexit remains a fringe cause and Bruton believes, post-Brexit, Dublin will have no choice but to align itself more closely with the EU27. “The UK is walking away,” he said. “This shift has been imposed upon us by our neighbour. Ireland will have to do the best it can: any EU without Britain is a more difficult EU for Ireland.” 

May, he says, has exacerbated those difficulties. Her appointment of her ally James Brokenshire as secretary of state for Northern Ireland was interpreted as a sign she understood the role’s strategic importance. But Bruton doubts Ireland has figured much in her biggest decisions on Brexit: “I don’t think serious thought was given to this before her conference speech, which insisted on immigration controls and on no jurisdiction for the European Court of Justice. Those two decisions essentially removed the possibility for Ireland and Britain to work together as part of the EEA or customs union – and were not even necessitated by the referendum decision.”

There are several avenues for Britain if it wants to avert the “voluntary injury” it looks set to inflict to Ireland’s economy and its own. One, which Bruton concedes is unlikely, is staying in the single market. He dismisses as “fanciful” the suggestions that Northern Ireland alone could negotiate European Economic Area membership, while a poll on Irish reunification is "only marginally" more likely. 

The other is a variation on the Remoaners’ favourite - a second referendum should Britain look set to crash out on World Trade Organisation terms without a satisfactory deal. “I don’t think a second referendum is going to be accepted by anybody at this stage. It is going to take a number of years,” he said. “I would like to see the negotiation proceed and for the European Union to keep the option of UK membership on 2015 terms on the table. It would be the best available alternative to an agreed outcome.” 

As things stand, however, Bruton is unambiguous. Brexit means the Northern Irish border will change for the worse. “That’s just inherent in the decision the UK electorate was invited to take, and took – or rather, the UK government took in interpreting the referendum.”