Terry and Rob (I think it's Rob)
are on SKY ARTS 2 today at 11am and repeated on SKY ARTS 1 again at 5pm.
I'm sorry for the short notice but I caught the last half hour last night (12:30) by complete accident and spent this morning tracking down the earliest repeat showing. The interview lasts an hour and talks about Sir Terry's works and ends with a short question and answer session. I found his comments about Unseen Academicals very interesting and it even covers Snuff and The World of Poo.
Anyway, sorry once again for the short notice but I'm sure it will be repeated again at some point, maybe with some links for those outside of the UK or don't have access to Sky.