Who Needs Enemies (2013)

Tom Sheridan has risen through the London underworld and now owns a thriving nightclub. When Ian, an old friend and former colleague, asks to use the club for a private party, Tom agrees. But when he finds out that the party involved prostituting children to wealthy pedophiles, Tom sets out to make him pay. When Ian retaliates to Tom's retribution, a bloody war breaks out in London. Very strong language.