Two types of trial lesson. 1) prospective student - they do takeoff (not rudder) and after a brief demonstration of how to turn etc. fly most of the rest of the flight. Minimum interference and NO critiscism from me (unless they do a Stuka dive or something). 2) pleasure flight e.g. 100ft above the herds of seals basking on the sandbanks off the coast near Leuchars, watching others playing in the shallows, or as yesterday when a couple came in for a flight each, formating after departure with the opportunity for them to take photos of each other, then breaking off for a quick loop, roll, stall turn and flick roll (with the passenger's approval I hasten to add)before reformating for the return to base. Not only did they enjoy it hugely, so did we.