The skipper of a Royal Navy 'bomber boat' submarine that carries nuclear missiles has been given the boot. Top brass saw an X-rated video he made while on duty, according to reports.

The Sun reported that he was in command of a Vanguard-class nuclear submarine, armed with Trident Two missiles, when he shared the graphic vid with a junior sailor on the sub. It is not clear which of the four Vanguard subs – HMS Vanguard, Vengeance, Victorious and Vigilant – he skippered.

Colleagues alleged that the pair had an illicit physical relationship when the bomber boat was at sea, but a Royal Navy source reportedly told the aforementioned title that sex on board did not form part of the investigation.