Siân Brooke plays Grace Ellis, Katherine Devlin plays Annie Conlon, and Nathan Braniff plays Tommy Foster in Blue Lights.
Main cast
- Grace EllisSiân BrookeSeasons 1–3Main
- Annie ConlonKatherine DevlinSeasons 1–3Main
- Tommy FosterNathan BraniffSeasons 1–3Main
- Stevie NeilMartin McCannSeasons 1–3Main
- Sandra CliffAndi OshoSeasons 1–3Main
- Helen McNallyJoanne CrawfordSeasons 1–3Main
- BarneyFrankie McCaffertySeasons 1–2Main
Supporting cast
- Gerry CliffRichard DormerSeasons 1–2Supp
- James McIntyreJohn LynchSeasons 1–2Supp
- Mo McIntyreMichael SheaSeasons 1–3Supp
- David "Jonty" JohnstonJonathan HardenSeasons 1–2Supp
- Jen RobinsonHannah McCleanSeasons 1–2Supp
- Nicola RobinsonAndrea IrvineSeasons 1–3Supp
- Tina McIntyreAbigail McGibbonSeasons 1–3Supp
- Aisling ByrneDearbháile McKinneySeasons 1–3Supp
- Shane BradleyFrank BlakeSeasons 2–3Supp
- Aodhan McAllisterMatthew ForsytheSeasons 1–2Supp
- DS Murray CanningDesmond EastwoodSeasons 1–2Supp
- Gordon MackleDane Whyte O'HaraSeasons 1Supp
- Angela MackleValene KaneSeasons 1Supp
- JosephNabil ElouahabiSeasons 1Supp
- Happy KellyPaddy JenkinsSeasons 1–2Supp
- Mags ThompsonSeána KerslakeSeasons 2–3Supp
- Lee ThompsonSeamus O'HaraSeasons 2–3Supp
- Craig McQuarrieCraig McGinlaySeasons 1Supp
- Rab McKendryDan GordonSeasons 1Supp
- Robin GrahamDerek ThompsonSeasons 1Supp
- Dana MorganCathy TysonSeasons 3Supp
- Paul "Colly" CollinsMichael SmileySeasons 3Supp
- FogertyCharlie MaherSeasons 2–3Supp
- Lindsay SingletonAoife HughesSeasons 3Supp
Guest & voice
- MarianPaula McFetridgeSeasons 3Guest
- John O'BoylePatrick McBreartySeasons 3Guest
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About this cast
Blue Lights is a BBC One and iPlayer police drama, now in its third series. The lead cast includes Siân Brooke as probationer constable Grace Ellis, alongside Katherine Devlin, Nathan Braniff, Martin McCann, Andi Osho, Joanne Crawford and Frankie McCafferty.
Cast FAQs
Who plays Grace Ellis in Blue Lights?
Grace Ellis is played by Siân Brooke.
Who plays Annie Conlon in Blue Lights?
Annie Conlon is played by Katherine Devlin.
Who plays Tommy Foster in Blue Lights?
Tommy Foster is played by Nathan Braniff.
How many cast members are in Blue Lights?
The series has 33 cast members in total.
Who is in the cast of Blue Lights?
The lead cast includes Siân Brooke, Katherine Devlin, Nathan Braniff, Martin McCann, Andi Osho, Joanne Crawford, and Frankie McCafferty.
Sources: IMDb · IMDb · Radio Times · BritBox · Rotten Tomatoes · Updated June 2026
Related cast guide: Blue Bloods