This application will show you all London Morrisons stores on the map and you could see your live location on the same map.
The software has an option to save your location data in a file on the iPhone. So you could retrieve and view all of your location changes on the map.
Also if you need to call Morrisons branch you can easily call to the branch by just clicking Branch icon.
(Continued use of GPS running in the background can dramatically decrease battery life.)