Why call this Trolley when it doesn't do a full trolley price comparison ?

The amount of hours I need to work I don't have time to visit several different shops to get what we need for a week plus the cost in travel to visit several different retailers needs to be considered.

What's needed is a comparison of the full trolley total cost of your weekly shop at various supermarkets so you can decide which shop to go and get the groceries at that week.