I thought I’d like ‘Sherlock’, because I like both Sherlock Holmes apocrypha and Steven Moffat scripts, but I didn’t think it could surprise me. Brilliantly, I was very, very wrong about this.

Luther, the first British star vehicle for Idris Elba, is a combination of lightweight detective show cliches and preposterously grandiose villainy that isn’t so much bad as a bit baffling.