“Blue Lights,” which tracks three probationary police officers and their mentors in Belfast, has been a bright light for BritBox since its launch, three seasons ago.

In Season 3, now streaming, Constable Grace Ellis (Siân Brooke) makes a dramatically deep dive into her previously hidden personal history as the series takes a realistic look at the complications of living and loving fellow officer Sergeant Stevie Neill (Martin McCann).

“It’s been lovely to explore that dynamic between these two characters who’ve lived a life. This isn’t their first time around the block,” Brooke, 45, noted in a phone interview.

“They’re both older. Both, in terms of love and people, have been burnt in their past. So they danced around each other for the first two series.

“Then, it came to a point, ‘We ca

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