Well, been driving for a day now, not far but have tried out a few of the functions and gimmicks and am generally mightily pleased so far.
I have solved the indicator issue, and as @MG Clive suggested, I just wasn't pushing the lever far enough. I have had two little niggles so far though.
First is a mystery rattle from the boot area as if something is rolling around there. Each time I turn a corner or go over rough ground I'd swear there was some object loose there. However, the boot area is empty and there's nothing loose under the boot floor.
Secondly after trying the One Touch Escape function (moving out of a tight parking space successfully), the lower screen kept the displayed image of the car with a button labelled "Pull Out" which I'd initiated the function with. I could not get rid of that screen no matter what I did. No matter where on the screen I pressed (including that "Pull Out" button) or how long I pressed for, I could not bring up any other screen. I even pulled over and got out of the car and locked it, but it was still there when the car rebooted. This persisted for around another 10 miles of driving, when eventually the bottom line of buttons reappeared and I was able to get off the screen. I have no idea if it timed out or I accidentally hit upon the way to exit the screen (I was looking ahead and just poking away at random on the screen without looking at the time).
I may have to get back to the dealer about this. I know he won't know how to solve the One Touch Escape issue (don't ask) but hopefully a technician can trace the loose item.