Because of his duties with the play, Ben says that he plans on attending the red carpet for the World Premiere, after which he will head over to perform in Birdsong. He hopes to make it to the after party when he finishes his role that evening, though.
Narniaweb, who was informed of this interview, writes: Ben also discusses his role in the action scenes from Prince Caspian and Dawn Treader. He indicates that while there is less action in the latter film, he is more personally involved in it than in his previous jaunt to Narnia. Ben also mentions various sundries such as falling down rooftops and a scene involving King Caspian forced to fight foes with a pair of handcuffs, referring to it as an “archaic Jason Bourne” scene.
You can listen to the full interview here.