Somerfield said Mount was going to pursue "a personal venture" and said she had worked tirelessly to build the reputation and breadth of Somerfield's wine range and boost its profile as a high street wine retailer. "I've had a fantastic career at Somerfield, but now is the time to pursue new opportunities and challenges," she said.
Mount started her career at Saccone and Speed, the wine and spirit branch of Courage, where she worked across all departments.
In 1991, Mount was approached by Gateway, which was setting up as Somerfield, to head up its wine-buying team. Somerfield will announce details of her replacement shortly.