Derren Brown is witty, urbane, clever and a keen student of what makes humans tick - which must come as a huge advantage when you are developing an evening’s entertainment based on kidology. He makes it clear he’s not a psychic or clairvoyant and that there is a rational explanation for everything he does in his two and a half hours on stage, and indeed describes himself as “Illusionist, mentalist and sceptic” - I imagine emphasis is on the sceptic.