We had been waiting for Merlin to confess to Arthur that he had magic powers for five series, but when it came it was something of an anticlimax. Merlin’s delivery of the longed-for revelation and Arthur’s response to it was so understated that if you hadn’t been paying attention you might have missed it. Still, the emotional dialogue that followed was rather more overstated. “I don’t want you to change. I want you always to be you,” said Arthur tenderly. You could have cut the sexual tension with Excalibur. No wonder Arthur and Gwen’s (Angel Coulby) saccharine-sweet relationship always seemed so unconvincing.