NAIL-BITING FINALE

The Undeclared War, 9pm, Ch4

COMPUTER whizz Saara (Hannah Khalique-Brown, pictured) tries to minimise the damage caused by a massive data leak while also trying to stop another attack as the cyberwar thriller comes to a conclusion. Did her friend and GCHQ veteran John (Mark Rylance) really share state secrets with the Russians? The global chaos caused by the hacking continues, matched only by the turmoil of Saara’s love life.