Warship (1973)

Season 4: Episode 6

HMS Hero is docked at Eddowes Island, which is about to be handed over from British rule. The locals are welcoming to the Hero's crew, but they're opposed to the handover, and some are resorting to violence. The Hero's crew are asked to help keep the locals in order, which worries Captain Holt, and Lt Napier in particular.