An army of Islamic State terrorists has advanced to the outskirts of Vienna, Spain has cut off routes to Gibraltar and Nigel Farage – prime minister of 'Great England' – has deported all immigrants who have arrived in the past ten years.

This, according to the BBC, is what the world would be like if the European Union were to collapse.

The apocalyptic vision of a continent in which social order has broken down – to be screened on BBC4 tonight at 10pm – has been condemned by Eurosceptic critics as 'scaremongering'.

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Calamity: The Great European Disaster Movie, according to the BBC, is what the world would be like if the European Union were to collapse

The 75-minute film shows what the supposedly impartial broadcaster suggests might happen should the EU implode, and depicts the final days of the European dream as it turns into a nightmare of worthless currencies and predictions of even darker days to come.

The BBC describes The Great European Disaster Movie as an 'authored documentary', but the film – which features comedian Angus Deayton as an archaeologist struggling to explain what the single currency was to a young girl sitting next to him on a plane – has been criticised as a hyped-up piece of pro-EU propaganda.

Horrifying images of concentration camp victims are interspersed with wartime footage of devastated cities, while commentary is provided by former Economist editor Bill Emmott, who made the film with Italian journalist Annalisa Piras.

In the film, Mr Emmott warns: 'Our worry is that if Europe continues on its current path, the EU will collapse and that that would have catastrophic consequences for all of us.' Viewers see a glimpse of a post-EU continent in which:Visas and landing cards are required for travel between European countries;

A power crisis in Germany has put Berlin airport out of action.

The new president of France, far-Right leader Marine Le Pen, has declared a state of emergency.

EU chiefs, meeting in Berlin, have abolished the euro.

Looters are rampaging through Rome after the shooting of protesters by police.

Fierce fighting erupts in Vienna as the 'unstoppable' advance of IS fighters continues.

The terrifying sequence of events ends with Angela Merkel resigning as European Council president and overseeing a vote to abolish the EU. In his commentary, Mr Emmott admits immigration imposes financial burdens on nations but insists that in the long term it creates the resources needed to maintain a welfare state.

In the film, the girl – apparently being deported from Britain because she has an Italian mother – asks Angus Deayton about pictures of bridges on an old euro banknote.

He tells her: 'They were supposed to symbolise unity, unification, all the countries being connected. It was a great idea but unfortunately it didn't work.'

'Faction': The BBC describes The Great European Disaster Movie as an 'authored documentary', but the film has been criticised as a hyped-up piece of pro-EU propaganda.

Mr Emmott and Ms Piras say the film expresses their personal views and is intended to provoke debate. But last night it was condemned by Tory eurosceptic MP Sir Bill Cash as 'scaremongering'.

He said: 'It would be much better if the BBC provided us with a proper analysis of what has gone wrong with European structures.'

And Tory MEP Daniel Hannan said: 'This is typical of the pro-EU side. They make such ludicrous claims they make themselves look ridiculous.'

Tonight's broadcast will be followed by a discussion by a panel of guests including Mail on Sunday columnist Peter Hitchens and Ukip MP Mark Reckless.

A BBC spokesman said: 'BBC editorial guidelines do not prevent the commissioning of programmes which approach subjects from a particular perspective.'

And Mr Emmott said: 'It's a warning of what could happen if Europe continues on its current path.'