If you met a member of the RF in a social situation where you are there in the same capacity (e.g. you're another mum watching your DC play sport, or you're at a private house as you have mutual friends), should you bow/curtsy? And should you address them as YM /YRH when you're introduced.
It's not happened to me yet (only met them when they're working and therefore did curtsy/YRH them) but I've always been intrigued what people if they end up sitting next to them at the school concert.