Spooks – BBC3, 9pm

LUCAS North's past catches up with him this week when his former Russian prison torturer Oleg Darshavin turns up out of the blue. That's why, when you work for the intelligence services, you should never put yourself on Facebook.

Thankfully Oleg has changed his ways. He's left his tooth chisel and thumbscrew at home, probably trying to travel light, and it's at least half an hour before he's pushed his host's face into a freezing cold bath.

Oleg does, however, come armed with intelligence about a Sudanese terror attack on London. However, his information comes at a price and it's one Harry and Ros are not willing to pay. MI5 is cost-cutting just like everyone else these days.

The pair also fear that Darshavin still has a hold over Lucas, concerns which are soon realised when Lucas goes off the radar and meets Darshavin at his own flat, offering him some meths to make him feel at home.

Lucas struggles to keep control of the situation but manages to bring Darshavin to the verge of revealing the target – until CIA officer Sarah Caulfield turns up and throws the entire operation into jeopardy.

With Lucas's and his lover's life in danger, he has to use all his powers of persuasion to get the Sudanese terrorist's name out of Darshavin and keep himself and Sarah alive.