It was a joy to work with David, Billie and John Hurt. I’ve worked with Billie before and I’d obviously seen all of David’s work, especially as the Doctor. He’s a brilliant actor and a brilliant Doctor. It’s quite strange, I always sort of get that surreal thing of looking and David and thinking, ‘Oh my God, there’s Doctor Who’. And John is acting royalty. Another wonderful Doctor and again, a good bloke. I think looking back over my tenure on this show one of the great privileges has been the quality of actors that you get to work with.