This work can be further validated in his choice of roles in action films Battleground, written and directed by Neil MacKay, and Outpost: Rise of the Spetsnaz, by Scotland-born screenwriter Rae Brunton.
After guest roles in Scottish TV shows Taggart, Rebus and River City, he wrote and starred in the short film SCENE,[4] for which he won a BAFTA Scotland Award for his performance.
In 2017, he was cast as the lead antagonist, Ernest Hunt, in the Hong Kong film Chasing the Dragon (Chinese: 追龍), previously known as King of Drug Dealers.
One reviewer claimed that his performance was "uneven"; Larkin stated: "No character ever is... That's dull.I wanted to show Hunt's sociopathic, and villainous side, both quietly and bombastically.
Larkin was also set to reprise his role as the SAS commander opposite Gerard Butler in Angel Has Fallen, but reportedly owing to story development the shooting script no longer featured his character.
The central storyline follows Larkin's character across Asia, the United Kingdom and Los Angeles in his pursuit of the key players in a global human trafficking ring.
[12] in 2020, he was cast in The Point Men, formerly known by its working title of The Negotiation, opposite South Korean actors Hwang Jung-min and Hyun Bin, in the supporting role of Abdullah.
In 2022, he returned to South Korea to commence shooting of Netflix series Narco-Saints opposite Park Hae-soo, Ha Jung-woo and Hwang Jung-min.