Le sigh. I thought the trilogy of the last three episodes of Series 9 (Face the Raven / Heaven Sent / Hell Bent) were a fabulous cohesive unit, with the subsequent Christmas special a poignant lagniappe. I'm going to miss Peter Capaldi. Kicking that wall with his Doc Martens wouldn't have had the same impact, figuratively or literally. And to blow a hole in the wall a la Ace, he would have had to have had Ace's backpack now, wouldn't he?