The Prime Minister is branded 'pathetic' by top Brexit negotiators from the European Parliament in a new film about talks between Britain and the EU.

Brexit: Behind Closed Doors shows a team led by Guy Verhofstadt branding her 'insane' and laughing at the UK.

Verhofstadt's chief of staff, Guillaume McLaughlin, responds to the news that a Brexit deal is no longer possible because the PM hasn't cleared it with the DUP, with a foul-mouthed rant.

Theresa May (left) is mocked and branded 'insane' by a member of team led by Guy Verhofstadt (right)

The series features negotiators ridiculing Britain and Theresa May, who is referred to as insane, pathetic and ridiculous

He says: 'What the f*** is wrong with her. That’s insane. "I don’t know, I haven’t spoken to her?" That’s ridiculous. Pathetic, pathetic.'

The fly-on-the-wall BBC documentary shows him scream 'oh f*** off' at a TV screen showing Mrs May telling the Tory conference she wants a deal as Edel Rettman Crosse, Verhofstadt’s top aide, backs him up.

Michel Barnier (pictured) suggests that the bloc negotiates with someone stable, available and reliable, much to the amusement of Guy Verhofstadt

Theresa May (left) is mocked in the series, which shows Verhofstadt's top aide suggesting that a Leave-supporting be 'shood' out

After Leave-supporting Andrew Rosindell MP argues with Verhofstadt over the Irish border, Crosse tells Verhofstadt: 'I’m most proud of you when you take on a Tory, he was a f***er' and adds he should 'shoo the f***er' out.

The two-part BBC4 series starts tonight and also shows top negotiator Michel Barnier mocking Britain.

Michel Barnier (pictured at the EU Parliament) features in the series, which shows top negotiators mocking Britain

It also features Verhodstadt commenting on Mrs May's infamous twerk to Dancing Queen as an Italian MEP suggests Barnier's theme should be The Winner Takes It All.

Roberto Gualtieri, member of the Brexit Steering Group, suggests that Barnier should use the song, to which Verhofstadt says 'that would be sexier'.

The series also reveals disparaging comments by German Christian Democract MEP Elmar Brok, who says the EU must not help the UK while it is 'in a mess'.

It was created by filmmaker Lode Desmet, who is Belgian and had exclusive access to Verhofstadt and his team for two years.

In his series, Michel Barnier speculates as to who the EU should negotiate with in the talks.

He asks whether it should be Brexit Secretary David Davis or Downing Street adviser and suggests it should be someone 'stable, available and reliable'. Verhofstadt jokes that the bloc cannot ask to much of Britain.

Top aides lay into Theresa May in a documentary that gave exclusive, behind-the-scenes access to journalists

May is branded 'pathetic' by people working to negotiate a deal between the EU and UK as it prepares to leave the bloc