Colin Firth has admitted that getting the stammer just right in his new movie The King's Speech was a struggle.
The actor takes on the role of King George VI, the new movie by Tom Hooper, as he tries to overcome his stammer.
Speaking to The Guardian the actor said: "There are so many pitfalls - if you stammered the wrong way, it might be comedic and that would be a problem.
"If it was too painful, audiences would start to wish they were not in the cinema. If it was too severe, it would slow the film down. The stammering had never to misfire.
"The other risk was that we would run shy of it and, because of our fear about pacing, not commit to it enough. So the rhythm of the stammer was key."
Firth has already been tipped to pick up the Best Actor Oscar for his performance later this year, he picked up his very first Academy Award nod last year for A Single Man.
The actor has already completed work on Main Street and is currently filming Tinker, Tailor, Soldier, Spy, which sees him team up with Tom Hardy, Gary Oldman and Mark Strong.
The King's Speech is released 7th January.
Tagged in Colin Firth