Sainsbury's explains why large marquee is up at Marsh Mills The supermarket giant says it is using the temporary facility for storage purposes whilst work is being carried out inside Updated The video will auto-play soon8Cancel Play now Never miss a big story in Plymouth again with our daily newslettersInvalid EmailSomething went wrong, please try again later. Sign me up! When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice. Thank you for subscribingWe have more newslettersShow meSee ourprivacy notice A large marquee which has appeared in the car park of the Sainsbury’s store at Marsh Mills, Plymouth, isn’t a vaccine centre the supermarket has verified.