Charity Flights are covered by an AIC (AIC 50/2000 White 20) which you can download in PDF format off the internet.
The bottom line is that providing you:
- meet certain minimum experience and currency requirements
- have your plane maintained to PT standards
- fly in Day/VMC from a licenced strip
- do not leave an area of 25nm radius from departure and do not land away
- carry no more than 3 pax at a time, on no more than 3 flights per day
Then you are pretty much OK. Check the AIC though because there are lots of little gotchas to consider.
-2Donkeys