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How to watch Blue Lights season 4 for FREE from anywhere
Blackthorn Station finds itself woefully shorthanded amid a swell of street violence
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Watch Blue Lights season 4 for free on BBC iPlayer (UK)
Unlock your stream with NordVPN (save up to 75%)
Premiere: 6am BST on Tuesday, September 29, 2026 (UK)
Gerry Cliff (Richard Dormer) returns to deliver a bombshell revelation, while a tide of anti-immigration violence render Grace Ellis (Siân Brooke), Tommy Foster (Nathan Braniff), and Annie Conlon (Katherine Devlin) beyond disillusioned in what's shaping up to be a characteristically pulsating fourth season of Blue Lights.
They've passed probation, but with…
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