Documentary going behind the famous gold-and-green facade of the London retailer, revealing the store's origins and the secrets of its success. Viewed as a uniquely British institution for more than 150 years, items on sale range from precious gems and high-class toys to designer fashions - meaning it remains a popular choice for shoppers wanting to indulge at Christmas. Former grotto staff share their secrets about what the super-rich might ask of Santa, while former employees reveal what it is like looking after celebrities and royalty during the festive season.