The spa marks the first time Ainhoa's products have been sold directly to UK consumers, and is also the first pop-up shop on the station’s Grand Terrace area.
It will be in place until the end of January, offering a range of free express treatments to men and woman and selling Ainhoa products made with ingredients including gold, diamonds and caviar.
Brandnew has been working on events and marketing for St Pancras for two years. Alex Johns, managing director of Brandnew, told Event: "We’ve been working on the Grand Terrace for a long time to try to turn it into more of a retail area. Last year we transformed the windows in the space, but this is the first time a brand has taken over the space for an extended period of time."
He added: "In a time when many traditional retailers are going out of business, we are trying to put the experience back into retail."
The Ainhoa brand was founded in Barcelona in 1996 and has previously been sold in destination spas and 5* hotels worldwide.
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