Can I add that items of flight preparation should not be missed, as they often are by examiners. On intial contact give the candidate your weight, that way when you arrive they should have a completed a loadsheet. Make sure the candidate checks the documents as per the check list, which includes your licence and medical. Finally the emergency brief, which from my experience is often not taught or carried out. So ask the student to give you an emergecy brief as if you had never flown in a light aircraft before, so location of fire extinguisher, firsr aid kit, how to open and close the door/canopy, use of the harness, parachute (if fitted) and acitions in the event of an engine failure.