An advert pumping out a chocolate smell at a busy London Underground interchange has led to passengers and Tube staff causing a stink.
The "multi-sensory" advert for ice-cream brand Magnum was installed in a tunnel between St Pancras railway station and King's Cross St Pancras Tube station on Monday.
But it has led to a number of complaints from passengers over the smell it is pumping out.
One passenger wrote on social media platform Reddit that the scent is "far too strong and makes me feel a bit nauseous".
Another described it as a "weird artificial chocolate smell like a chocolate-scented bubble bath", adding: "(It's) not really appetising at all, I don't like it."
Transport for London (TfL) workers based at the Tube station told the Times they have complained to the management of St Pancras station because the smell enters their break room.
The advert also plays a cracking sound to replicate someone biting into chocolate-covered ice-cream.
A spokesperson for Magnum Ice Cream Company said: "The Magnum activation at King's Cross St Pancras recreates the multi-sensory pleasure of enjoying a Magnum through sight, sound and scent, and is designed to bring a moment of enjoyment for commuters.
"Since the campaign began on March 9, we have received mostly positive feedback from commuters onsite and will continue to optimise the campaign which is scheduled to run until March 22 based on consumer feedback.
"Our intention remains for our campaigns to be engaging and enjoyable."
A TfL spokesman said the transport authority is aware of the issue and has raised it with Network Rail, which is responsible for the area where the advert is located.
It is not the first time advertising on Network Rail property has sparked concerns.
In October 2024, the Government-owned company was ordered by then-transport secretary Louise Haigh to stop using a 15-metre screen above the concourse at Euston railway station to display adverts. Network Rail was approached for a comment.
