HMS Vigilant

Nine service personnel on a nuclear submarine have been discharged from the Royal Navy after testing positive for drugs.

Compulsory drugs tests on HMS Vigilant produced nine positive results, leading to all nine individuals being discharged.

A Royal Navy spokesman said: "We do not tolerate drugs misuse by service personnel.

"Those found to have fallen short of our high standards face being discharged from service."

HMS Vigilant is one of four Vanguard Class submarines which maintain the UK's nuclear deterrent.

The Defence Secretary, Sir Michael Fallon, has ordered the First Sea Lord, Admiral Sir Philip Jones, to carry out compulsory drug testing of the crew of all Royal Navy submarines.

Mr Fallon is said to have given the First Sea Lord, Admiral Sir Philip Jones, a "roasting" over the incident.

The Daily Mail reported that the drug detected by the tests was cocaine.

The submarine was involved in another controversy earlier this month over allegations of an onboard relationship between a male and female.

The MoD said it was probing an "inappropriate relationship" between crew members and that the captain of the vessel had been relieved of his duties pending the outcome.

A Royal Navy spokesman said at the time: "We can confirm an investigation is underway, but it would be inappropriate to comment further at this stage. Any allegations of wrongdoing are taken very seriously and will be dealt with appropriately."

There are strict Royal Navy rules about relationships on board vessels.

In 2014, the first female commander of a frontline Royal Navy warship left her vessel due to claims that she had an affair with a shipmate.

She was “removed from command” of the Type 23 frigate and appointed to another position.

Commander Sarah West, who denied the relationship, was "removed from command" of the Type 23 frigate HMS Portland and re-appointed to another post.

Commenting on the case in 2014, a spokesperson for the MoD said:

 “Social misconduct has the potential to break down trust within military units which depend upon respect, loyalty and discipline to retain their close-knit structure and capability.”