Yes, the law is irrelevant, you'd do it anyway. There's a whole bunch of stuff you want the passenger to know how to do, and how are they going to know if you don't tell them?
- Go to the loo before walking out to the aircraft
- Do what they're told on the airfield
- Keep away from the prop
- How to work their seatbelt and door
- Where the sick bag is
- "Tell me if you're feeling sick, don't just go quiet"
- Keep hands and feet and camera straps ect ect off the controls
- Don't drop anything on the floor
- Shut TF up if I tell you to, I'm busy
- Watch out for other aeroplanes
- Open their door before landing off airport
- Press the tit on the ELT after a crash if pilot incapacitated
- Know where the Pooley's is and be ready to hand me the right page on diversion
- Know where the fire extinguisher is
- Know where the first aid kit is
- Remind me to take my spare glasses when we leave the aircraft
And that's just the stuff for my comfort and safety!