OK, why buy the CD version of the story for an extra five quid or so? Because it's read by David Tennant, and if you're like me and love the way his voice just bleeds with enthusiasm you'll want to give this a try. He reads the prose sections in his natural accent before effortlessly switching to the voice of the Doctor, as well as all the incidental characters - a cleaning lady, an American admiral, an Indian shopkeeper, a little old lady from Edinburgh... I won't lie and say Rose and Mickey didn't give him a bit of trouble, but in this format the book feels far more like a real extra episode of Doctor Who, perfect for banishing those "end of series" blues!