Feeling silly now: with the new car only hours away from being collected (pause for another woohoo moment), I set up the MercedesMe account on my PC and then went to get an app for my phone. But I discover it's too old apparently, so I can't use it - the Apple IOS version is not modern enough...
Apparently it does the following:-
The Remote Parking Pilot provides a simple means of steering your vehicle from outside with your smartphone. How it works: You scan the parking space as you drive by, then get out of the vehicle and steer it into the space from outside. "Key parking" and the...