Philippa Boyens is the writer and producer behind The Lord of the Rings trilogy, as well as King Kong, The Lovely Bones, and all three of The Hobbits, working alongside Jackson and Fran Walsh throughout. While she was here in London promoting the first installment of the Hobbit trilogy, Boyens stopped by Empire's podcast studio to talk us through some key moments of how they made the film - though as you may have guessed, it's chock full of spoilers, so be sure to listen to this only after you've watched the film...