Image source, Getty Images

OK, here’s a biggie – what impact does EU migration have on wages and jobs?

We’ve crunched the numbers. Firstly, on jobs, the stat often trotted out is that for every 100 migrants employed 23 UK-born workers are displaced.

Is it true? Well, it’s worth noting that this was based on data from 1995-2010 and it refers specifically to migrants coming from outside the EU. No statistically significant effects were found for migration from within the EU.

So how about wages? There is some truth in the claim, made particularly by those on the Left who want to leave the EU, that migration has had an effect here.

A Bank of England paper, external last year found that a 10% increase in the proportion of immigrants working in the services sector would be associated with a 1.88% reduction in pay.

Important to note, though, that in the 18 years between 1997 and 2015 the proportion of non-UK nationals working here only increased by 6.4%.

It’s also worth noting that in both the case of jobs and wages, it’s the overall strength of the economy which will have the biggest effect, not migration per se.

For more EU fact checking, head over to our colleagues at BBC Reality Check.

Total EU immigration was running at about 100,000 people a year until 2004, when it rose as a group of Eastern European countries joined the EU. Annual EU immigration is now a bit under 300,000 people a year.

EU immigration is less than half of total immigration, which is over 600,000 people, but it drove the medium term rise.

Remember, people leave too. Net immigration is about half of those totals.

Some of those East Europeans come here temporarily, living in cramped housing and saving up. Then they go home again.

We thought you'd be interested in one more snippet from the new Ipsos MORI poll we got our hands on for tonight's immigration special. 

They asked whether respondents thought the issue of immigration has been discussed too much in Britain, too little or just about the right amount.

As you can see from the results, more people think it has been discussed too little (36%) than too much (25%), or indeed those who think it's been discussed the right amount (31%).

Those numbers are pretty consistent with when the pollsters asked the same question last year - but look at the difference from two years ago, when 62% thought immigration had been discussed too little and just 11% thought it had been discussed too much.  

Never say we here at Newsnight don't give the public what they want! Maybe the pollsters should re-run that question once our special comes off-air and see if the numbers change...

The new claim from the Leave camp - debuted today by Iain Duncan Smith - is that the taxpayer needs to build the equivalent of 27 new average-sized secondary schools or 100 new primary schools to cope with EU migration.

This claim is based on an estimate made by National Statistician, John Pullinger, external, who used data from the annual International Passenger Survey, external to estimate the level of immigration of EEA nationals aged 5-18. For 2014, the most recent year available, the figure is 25,000, considerably higher than in previous years.

As Iain Duncan Smith says, that’s the equivalent of about 27 average-sized secondary schools or about 100 average primary schools.

In fact, he probably could have gone further because the 25,000 is just one year’s worth of immigration. But without more details about the age of the children who arrived, it’s difficult to be sure about the total long-term impact.

And let’s put it into some perspective. While 25,000 is undoubtedly a big number, it’s less than one pupil for each school in the country.

For more EU fact checking, head over to our colleagues at BBC Reality Check.

Let's delve back into that new poll by Ipsos MORI, which - rather conveniently - contains good news for both sides.

Firstly the Brexiteers will find succor in the fact that 66% think the number of immigrants from Europe will decrease over the next five years if Britain leaves the EU. Just 9% think numbers will increase.

That's important because a full 62% of those polled think that the numbers of immigrants to Britain nowadays should be reduced - that includes a very significant 42% who say the number of immigrants should be reduced a lot.

So, how about the good news for the Bremainers? Well, when forced to choose, more people prefer we continue to allow freedom of movement from the EU in order to maintain our access to the single market.

But there's a but. 

The numbers are tighter than a gnat's bottom, with 42% picking that option and 39% going the other way, preferring to see access to the single market restricted in order to stop EU citizens living and working in Britain. The other 19% can't make up their minds.

Stay tuned for one more polling snippet!

Mark Urban
Newsnight Defence and Diplomatic Editor

It falls to me to do that Scotty (or maybe Chekhov…) thing on the bridge of the Enterprise thing while Evan is beamed down to Boston tonight. If for some reason the signal fails to cling on (geddit?!) they may suddenly turn the cameras on me. Hopefully I will not look too stunned. In the meantime I will follow the debate up there and maybe chip in the odd comment into the live feed.  

We've got our hands on a rather tasty poll from Ipsos MORI, which we can now [trumpet fanfare] bring exclusively to you.... 

The key finding: immigration is the third most important reason in helping people decide how they will vote. A full 48% say immigration will be an important deciding factor for them, just pipped to the top spots by the impact on Britain's economy and Britain's ability to make its own laws. Here's how people rated issues in the Ipsos MORI poll:

1. Impact on Britain's economy - 57%
2. Britain's ability to make its own laws - 50%
3. Number of immigrants coming into Britain - 48%
4. Cost of EU immigration on Britain's welfare system - 47%
5. Impact on British jobs - 46%
6. Number of refugees coming to Britain to claim asylum - 42%
7. Britain's ability to trade with countries in the EU - 40%
8. Impact on the rights of British workers - 37%
9. Britain's relationships with other countries - 36%
10. Regulations by the EU on British businesses - 32%

Interestingly enough, when asked which one factor will be most important for the public overall, immigration comes joint top with the economy, each getting 24%. Britain's ability to make its own laws comes a long way third, with 9%.  

The poll has a whoppingly large sample – with 4,000 people taking part – and was conducted online over the second half of April.

Keep your eyes peeled for more titbits from the results over the course of the evening!

Tonight's topic is migration...  What impact would a possible Brexit vote have on EU migration? 

We're live in Boston, Lincolnshire for a one-hour special on BBC 2 and at the top of this page NOW.  

Those from Vote Remain and Vote Leave will doubtless have strong opinions on immigration, but what does it mean to our ordinary voters? 

The issue is fairly clear-cut for Holly Anderson, who says: "We have to carry on with free movement because migrants contribute massively to the jobs market... they are doing jobs that English people don't want to do".

She doesn't think an 'emergency brake' on in-work benefits for migrants would work, because "most immigrants aren't coming to the UK to be benefit tourists... they are here to work".

Bipin Dattani has mixed opinions and says that without migrant workers, certain industries like infrastructure and healthcare could suffer.

Bipin says he's concerned migrants could be "driving down wages" and making it difficult for young British people to find work. 

If the UK voted for Brexit, "we could prevent a lot of benefits scroungers", he says, "putting in controls so that immigrants have to have the means to support themselves".

The number of migrants entering the country is something Angela Garvin's interested in too, as well as those already here.

"There seem to be no real curbs... and the planned restrictions don't go far enough," she says.

Shan Abidazeh says: "It seems that we have an 'open door' policy where anyone from Europe can come in... people think they are getting jobs and homes. 

"I believe in a strong Europe, and maybe we should be part of that. But my concern is for my children – how do we deal with the people who are already here?"

Will migration from EU countries be a factor in how you vote in the EU referendum?

Do you think the result – whether we remain or leave – will have an impact on future migration from EU countries?

Let us know your thoughts by tweeting us @BBCNewsnight, external using #newsnight

Image source, AFP/Getty Images

Tonight we're coming live from Boston in Lincolnshire... Why?

Well according to the 2011 census, it is home to more than 65,000 people - but around 10,000 of them are born abroad.

Many migrants move to the area to take up seasonal farm work in the county, including jobs harvesting fruits and vegetables.  

Boston has the largest proportion of non-British EU passport holders outside of London - 12.1% of the town's residents - and in January the think-tank Policy Exchange named Boston, external as the "least integrated place" in England and Wales.

Residents are divided over whether EU immigration is a good thing.

They largely fall into two camps: those who say the migrants have created new jobs and brought wealth to the rural town; and those who say migration has only had a negative effect by driving down wages, taking jobs away from locally-born residents, and pushing out "English" shops.

Evan Davis
Newsnight Presenter

Migration is surely the most troublesome issue for the Remain camp in the referendum.

Why? Partly because it matters to people. A lot. According to an Ipsos Mori poll published this evening, about half of us consider it "very important", not too far behind the economy and virtually level but with sovereignty. 

And it is also a vulnerability for Remain because in a campaign in which facts are often disputed and confusion is deliberately sewn, migration appears to have one big certainty associated with it. If we are willing to leave the EU and the single market, we can choose what our immigration policy is: we can choose to continue letting EU citizens enter freely if we want to. Or we can restrict entry. In short, we lose no options, but we gain others. No need to debate the merits of immigration – Brexit clearly allows us to finesse our policy as we please.

And then there are other difficult questions for Remain: the official population projections for the UK have the population growing to 80 million by 2060. That number sounds a lot to most people, especially considering that England is already among the most densely populated nations of Europe.

In programmes on the economy and security, it was easy for the Remain side to contrast the risks of leaving the EU with the safety of staying put. Immigration is the one issue where it feels the boot is on the other foot.