My tuppence ha'penny worth; I've kept quiet 'cos I wasn't sure if I was even going to manage to be there for one day, now I "ought" to manage Friday & Saturday
I think you had the right idea John, sometimes we just have to go with what we can manage though.
I do see your point too Wayland, and I think for things like babywipes/ handwipes, etc., it's very necessary, but I can't see folks carrying home the liquid stuff, and that needs dealt with anyway.
I'm hoping to be there on Friday; I've got a trenching spade and I can provide fabric for screening too. It'll need poles of some kind though....heavy garden canes will do if we can't cut poles.
Alternatively, brushwood screening is available cheaply in the old Poundstretchers stores just now; theoretically it could be left on site and it would make a good basis for growing ivy and willow for a tree bog.....maybe Stuart would be the best one to advise on this issue ?
From experience of mixed camps, two are better than one, and if one is for *standing* and one for sitting, better yet. Those who don't come ready equiped with the handy wee hose attachment would prefer a seperate loo, but since we all live in families anyway, we're used to the logistics of sharing.

Still need to figure out the sitting part....trousers down and hanging onto a pole gets old very quickly
Siting the trench is probably better left to those who arrive early but I think Graham's idea sounds practical, and at least that way it's got a long way to be worked on by soil bacteria, etc., before it ends up in the water.
If off in the woods in small numbers there's rarely any need to make an issue of the loos, but in large groups it can become a real problem very quickly. Lets just deal with it neatly and get on with the weekend

It might not be very Bushcrafty but it's practical.
Thanks for looking into the portaloo possibility James.
Cheers,
Toddy