It therefore goes without saying that a Trial Lesson MUST be preceded by a Briefing and followed by a Debrief. (In addition to the mandatory safety brief.)
A few training outfit operators, would, I suspect, like to programme back-to-back running-change TLs for their instructors, leaving no time for the briefing process. FIs beware Illegal Public Transport: it's your licence at stake.
Air Experience flying....now only a fond memory.......demonstrating 'Further Effects of Controls' as the dear old Chippy floats over the top of a gentle loop on a summer's afternoon with an air cadet in the back seat. Ahhhh!