Signs of irregularity in the UK general election results prompt political unrest - and GCHQ staffers are hit with a massive curveball that puts their co-operation as an intelligence force with the United States in jeopardy. Amid the protests, John Yeabsley makes a stunning declaration. GCHQ looks increasingly compromised as security barriers that should be watertight are breached as Saara watches the damages mount while still trying to decipher the malware at the heart of it. Cyber thriller, starring Adrian Lester, Simon Pegg and Hannah Khalique-Brown.

S1 Ep5 60min