Siôn Daniel Young

Sion Daniel Young (born in 1989)

He trained as an actor at the Royal Scottish Academy of Music & Drama, now known as the Royal Conservatoire of Scotland.

Career Stage Young's first professional role was appearing in Daf James play Llwyth (Tribe), which was the first play about gay characters written by a queer person on a Welsh-language stage.

He played the role of Albert Narracott in War Horse at the Royal National Theatre, London in 2013.

In 2017, he played Davey in Gary Owen’s Olivier award winning play ‘Killology’ at The Royal Court Theatre.

In 2018, he led the world premiere production of Barney Norris’s play Nightfall at the Bridge Theatre, London, alongside Claire Skinner and Ophelia Lovibond.

In 2019, Sion performed in Ben Weatherill’s play‘Jellyfish’ at the National Theatre.

He then returned to the Royal Court theatre in London to perform in Ed Thomas’ ‘On Bear Ridge’ alongside Rhys Ifans.

Film and television Young appeared in the 2012 war film Private Peaceful. For the role he was nominated for Best Actor at the 2020 BAFTA Cymru Awards. The film won BAFTA and Royal Television Society awards for Best Single Drama.

In 2021, he played Colin Stagg in Channel 4 miniseries Deceit. A true story based on a man wrongly accused of murder in 1992, described as one of the gravest miscarriages of justice in British legal history. . Sion was nominated for Best Actor at the 2022 BAFTA Cymru awards for his performance.

In series three of Apple TV+ espionage thriller Slow Horses, he played Douglas, an MI5 records keeper. For this, Sion received his third Best Actor BAFTA Cymru nomination in 2024.

In 2024, Sion played the lead role of Gabriel in BBC One drama Lost Boys and Fairies. Written by Daf James, it was BBC One’s first primetime gay adoption drama.

The show also won ‘Best Mini Series’ at the 2025 International Emmy’s.

That year, Sion could be seen in Cardiff-set BBC One series The Guest alongside Gabrielle Creevy.

Personal life He is a first-language Welsh speaker.

Filmography Film Year Title Role Notes 2012 Private Peaceful Pete Bovey 2013 Another Me Joe, The Hooded Youth 2014 National Theatre Live: War Horse Albert Narracott Live broadcast from Season 5 2017 Stump Danny Short film

Television Year Title Role Notes 2012 Casualty Isaac Flack Series 26; episode 36: "Teenage Dreams" 2014 Our World War Sapper Neary Mini-series; episode 1: "The First Day" 2015 Hinterland Morgan Hopkins Series 2; episode 1: "Ceredigion" 2019 The Left Behind Gethin Television film Doc Martin George Pendrick Series 9; episode 4: "Paint It Black" 2020–2021 Keeping Faith Gareth Series 3; episodes 1–5 2021 Deceit Colin Stagg Mini-series; episodes 1–4 2022 Life and Death in the Warehouse Sean Television film Witness Number 3 PC Ivan Barkas Episodes 1–4 2023 Slow Horses Douglas Series 3; episodes 1, 4 & 5 2024 Lost Boys and Fairies Gabriel Mini-series; episodes 1–3 2025 The Guest Lee Mace Episodes 1–4