Gregg Wallace and Chris Bavin help a single mother from Amersham, Buckinghamshire change her excessive shopping habits in an attempt to lower her food bills. Gabrielle proves to be one of the pair's biggest challenges to date, as she often goes food shopping three times a day, seven days a week, with a weekly spend that is four and a half times the national average.

• Samantha Seager
• Chris Bavin
• Gregg Wallace