I hope I'm not boring anyone with old news... but I've just listenend to the Guardian Film Weekly podcast from 05/11/11 and it has a lovely interview with Benedict Cumberbatch. He talks at length about Tinker, Tailor, Soldier, Spy, his clothes in that film ("glamourpuss"), his rapid "traffic light" change of hair colour in recent months, a bit about Parade's End, being nominated together with Tom Hardy, etc. etc.
It's very interesting, charming and funny.
And still available for download
here