Joe Thomas, 30, Simon Bird, 29, James Buckley, 26, and 29-year-old Blake Harrison - who reprise their roles as hapless students Simon, Will, Jay and Neil in the comedy sequel - admitted they revel in their on-screen roles because it gives them an excuse to behave in a puerile way.

Speaking at the world premiere of the movie in London's Leicester Square last night (05.08.14), Blake told BANG Showbiz: "From day one, [the producers] set up an atmosphere whereby if something is funny, it's OK to do.

"I don't think we're individually the characters we play on set, but what I think we do is we regress into the kind of childish, puerile humour that the characters have."

James echoed the sentiment, joking: "You don't have to persuade us a lot to behave like childish idiots! Our excuse is that we're in 'character'."

And 27-year-old Emily Berrington - who plays new character Katie in the new movie - says that although the boys are more mature than their on-screen characters, she still had to endure plenty of gross behaviour.

She said: "They maintain a laddy atmosphere all the time, so there's lots of eating - daring each other to eat disgusting things - a lot farting and doing really terrible thing to try to put each other off.

"But I loved it, it made the whole experience really fun."