9pm, BBC One
The Belfast police drama doesn't mess around. Within the first half hour of the fourth series, we're treated to an intense set piece that touches on police cuts, the migration crisis, livestreaming culture and the changing meaning of nationalism – all while still working brilliantly as a thriller. Blue Lights' judgment of the zeitgeist remains impeccable, but its personal touches give it emotional weight, too. Superb.

The Great British Bake Off

8pm, Channel 4
It is biscuit week in the tent as the bakers are presented with three more challenges. First, US-style cookies. Then, a nostalgic technical task tests their childhood memories. And finally, a mosaic showstopper. With Nigella Lawson getting her feet under the trestle table, the show continues to hit its comfortingly familiar beats.

Stacey Dooley Sleeps Over USA

9pm, BBC Three

First shown on UKTV, this series sees Dooley go to Oklahoma to meet Autumn, a nine-year-old "guntuber". The charismatic vlogger has been shooting since she was two and her parents built her a range, where she shares her vast knowledge of the pursuit.

Paul C Brunson: Red Flag

9pm, U&W
Here are the concluding episodes of this upsetting real-life series that, hopefully, is a therapeutic outlet for its participants. The Married at First Sight relationship expert Brunson meets Hannah, who suffered increasingly frightening abuse from her former partner, and Melanie, who was taken in by a romance scammer.

9.30pm, Channel 4
Rob Beckett looks on as the "fortune seekers" trek further across Malaysia in arduous heat and humidity, trying to stop themselves accepting treats that will reduce the amount of cash they're playing for. On the temptation menu: frozen confectionery, cold drinks and a spa.

10pm, BBC Four
This evocative documentary explores football in a different age via the remarkable triumvirate of Matt Busby, Bill Shankly and Jock Stein. These three managers were born within 30 miles of each other on the south side of Glasgow and achieved extraordinary worldwide success. What role did their similar upbringings play?