Her character , Nellie , worked with several of the office workers on a special project for Sabre in a six episode arc .
The episode marks the fourth appearance of Catherine Tate as Nellie Bertram and her third consecutive appearance .
Nellie Bertram 's character Nellie Bertram Nellie , worked with several of the office workers on a special project for Sabre in a six episode arc .
The episode marks the fourth appearance of Catherine Tate as Nellie Bertram and her third consecutive appearance .