Ms B was very well prepared for this week's shop having established "how it works" following last week's mission. When I arrived at her door, she had list, money, and most helpfully, empty jars of the various products she wanted - a useful and tactile version of show and tell for your average GoodGym shopper.

With the layout of the aisles of her local Waitrose now embedded in my mind, I was able to find everything she had asked for reasonably quickly, including a particular brand of Superjam (who knew?), and where to find flat pancakes (in the chilled dessert section of course...). Every day really is a school day when it comes to these shopping missions.