A rant about the type of biscuits acceptable for an army captain is going viral among servicemen and women in the UK.

The 400-word email from a serving captain appears to have been sent after the commanding officer had to wait for some coffee.

"This is completely unacceptable," the email reads.

"It is something that needs to be done correctly otherwise you look like idiots."

The email was sent around 11am on 10 November with "high importance".

She then goes on to give advice about what brand of biscuits should be used and how paper towels should be "made handy" if cake is provided.

"Taylors is a good choice for coffee and don't scrimp on biscuits," the second bullet point of the email details.

"A selection of the following always go down well: Jaffa Cakes, choc malted milks, choc Hobnobs or digestives - and as a treat, party rings or pink wafers."

She continues: "I'm annoyed that I even have to write this. Get a grip and do the duty property", before signing off with "Enough said".

An annotated copy of the email, which is now being passed around other army service personnel, has been sent to Newsbeat.

The email has led to memes, many expressing sympathy for the junior officer responsible for coffee duty.

An army spokeswoman told Newsbeat: "It's a storm in a teacup."

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