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In this week's analysis,

Sonia Soda explores a key factor in Britain's fraught relationship with Europe,

Freedom of Movement.

It's a busy Friday evening here at Victoria Coach Station in the centre of London. There are coaches arriving and departing from across the UK.

But I'm standing here in front of the Euroline's check-in desk,

and it looks like there are coaches about to depart for Frankfurt and Amsterdam.

This is also the bit of the coach station where coaches come in from and go back to countries

like Poland and the Czech Republic.

I go to my country, I holiday.

I come in here for a job, 2005-6 I go work in Bradford, Harmmark, a big factory. I like this

people. Too much food, too much food, my country, too much money, money, too much money, too much money.

Too much expensive.

But will we still be seeing as many people like this,

arriving here from Europe in a decade's time?

Under pressure from negative public attitudes towards migration and the

impact people perceive it's had on jobs and local services, Prime Minister David Cameron

wants to permanently reduce the number of immigrants coming to Britain from the rest of the EU.

He said that for him this issue is critical as to whether or not Britain should remain a member

of the European Union. Many in Europe see

this is striking a dagger at the very heart of the European project.

There are a set of things which from the EU but also the Spanish perspectives are really unacceptable of what Cameron is asking for because they would effectively mean the end of the EU.

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