Your mum’s favourite serial killer is back. At the end of last year’s five-episode run of BBC2’s The Fall, Paul Spector (Jamie Dornan) packed in his moonlighting strangling escapades and carted his family onto the next Stenna Line to the Highlands. But you can’t keep a good stalker down, especially when he’s one half of the BBC’s most locally successful and internationally exportable drama for years. In last week’s sophomore opener, he’s back to eyeing up brunettes on the Larne line. In the meantime, creator Allan Cubbit has had to defend the show against claims that it glamourizes female violence,…