TV tonight: Blue Lights returns – and it’s as topical and thrilling as ever

Leem Lubany (Amira) and Siân Brooke (Grace Ellis) in Blue Lights. Photograph: BBC/Two Cities Television

Blue Lights

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. Phil Harrison