Reversing around a corner.
When I was a white van man (tm) I found this manoeuvre indispensable. When you miss your turning to a new delivery, a quick reverse around a convenient corner and a right turn to get back towards the delivery.
I can also recommend the C+E test, with the test starting on the manoeuvre and braking area, before you even get on the road.
You need to drive your vehicle forward an stop between two cones (width and front projection perception), then reverse diagonally into a "loading bay" (control of trailer, width and length of vehicle perception), finally followed by a drive forward and brake to a stop without loss of traction (control under heavy braking)
Don't get me started on "block / gate" gear changes and preparation to enter a roundabout.