If anything, episode two of BBC period drama Taboo was even more confusing than the first , with Tom Hardy’s mysterious adventurer James Delaney offering hints about his past, uncovering secret relatives and searching for assassins through the shadowy streets of 19th-century London. Eagled-eared viewers may have noticed that Taboo’s theme song was different this week, with the plink-plonk style of episode 1 replaced by a strings arrangement.