The Undeclared War
9pm, Channel 4
Espionage, malware and Simon Pegg doing his best serious face feature as Peter Kosminsky’s cyber-thriller returns for a second season. When we left him, GCHQ director of operations Danny Patrick (Pegg) had discovered shocking secrets about both the internal workings of government and his own marriage. Perhaps inevitably, things are now even worse. Saara (Hannah Khalique-Brown) has observed irregularities in flows of information that can only mean one thing: a mole in the intelligence agency. Plenty of scowling and running down empty corridors ensues, with Adrian Lester back as the prime minister and Siân Brooke joining as Danny’s wife, a former MI6 member. Phil Harrison
