TV tonight: Belfast’s brilliant cop show is back on the beat

Northern Irish police drama Blue Lights returns for season three. Plus, Prof Jim Al-Khalili gets inside our heads in a Horizon two-parter on the human brain. Here’s what to watch this evening

9pm, BBC One
Love is in the air as we rejoin Belfast’s peelers for a third season of the award-winning cop drama. Grace (Siân Brooke) and Stevie (Martin McCann) may be happily sharing cupcakes and house hunting on their shift (hurrah!), while Shane (Frank Blake) has now earned the team’s trust. But we know by now that this show likes to toy with our emotions – and things quickly get grittier as the officers are roped into a drug ring circling both the city’s estates and elite parties. Then there are all the personal dilemmas they’re dealing with. This show remains brilliant, taking you from laughing at this lovable lot one moment to gasping at what befalls them the next. Hollie Richardson