Metro claim the show is based on the PSP game.
Gangs Of London is actually based on a video game - here's what it was like
Sky’s newest drama, Gangs Of London, has already drawn in an audience, but did you know it’s adapted from an old PSP game?metro.co.uk
It's the only article that says it, which leans me towards it being bullshit.
Gareth Evans mentioned the game actually, let me find the video.
Here is is, time at when it's mentioned 12.00.
Unleashing Havoc: The Journey to Gareth Evans' New Film
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