Robert, Earl of Grantham, and Lady Edith Crawley are standing in front of the grand mantelpiece.

The Earl's dinner suit gloriously festooned, the lady's dinner gown in the style of 1924 - French chic.

Then, just above the marble mantel, between the sets of baroque vases and just below the romantic hunting portrait, it sits.

A plastic cylinder of unmistakable proportions.

Downton Abbey, your water bottle is showing.

Downton Abbey details the exploits of the British aristocracy during the early 20th century.

The publicity image was released on Thursday for the upcoming fifth series of the popular franchise.

The photograph has left the producers, publicists and photographers red faced, after it was pointed out to them that commercial water bottles were not produced until the 1960s.

It's not the only distracting prop that has managed to sneak its way into the series.

In the first season, a TV aerial antenna was seen spouting from a house - the year was 1912.

After the water bottle image was pointed out to the show's producers, they swiftly removed it from their Facebook marketing page.

It was too late, the internet had struck, and plenty of fans were waiting for their chance to contribute to the series.

Some just pointed out that they had indeed seen the water bottle. 

Others, like Jon Perry, offered their hand in reposting other versions of the water bottle on the mantelpiece.

For those less interested in historical inaccuracies and more enthusiastic about the scandals of the British aristocracy, the show's creator, Julian Fellowes, has said that this series will be about the characters coming to terms with the industrial world.

"We’ve got to the stage when it’s becoming clearer and clearer that the world really is a different place to the one it was 10 years before," he said.

"All of our characters have to make adjustments.

“And so the show this year is about them dealing with the fact that they’re now incontrovertibly living in the modern world.”