Right, I'll try to answer some of your questions now.
Sign & Banners
The zone does have one medium sized banner and two small banners. I believe these were on display during the day but towards the back of the stand?
We also had to smallish flags there but it's my fault they were not displayed, I was on the gate first thing then got side tracked cleaning my car and chatting. Sorry  
 
 
I have strong connections in the sign industry so we will make use of those for next years shows. The other slight issue is where/who keeps the items.
Membership charges
The team have spoken in depth about this before and felt it was the wrong way to go. Maybe more donations would help?
Finding the zone stand
This is something that Santa pod do and it is never very good. We could make more signs and try to place them somewhere but again it's a time factor. I got up at 7am after a nights drinking and they were letting cars in at 7.35 rather than 8am as they should. It does become a mad dash tbh.
Camping
The camping was pretty bad this year if I am honest. Ground was hard and there was very little grass to set up on.
Reggiebabe (James & Bev), Dave318 & myself were the first zoners there from what I saw and we chose a place that would be easy to get out of in the morning due to me having to be ready early.
As for not much interaction between the sections, Well I came over and chatted to most people and personally I think it's as much everyones fault for not mingling.
(Ezagood, Where did you set up camp?)
Zoner identification
This is always an issue, As has been said I don't want to wear a badge with my name on it!
I can make number plates, Or I can supply stickers if people want to get some perspex cut numberplate sizes. I am also looking into heat transfer vinyl to go onto t-shirts so you can have a personalised zone t-shirt.
I will push on with this over the next week, It's my holiday from work so can't promise when.
Merchandise
It was decided that we wouldn't have a merchandise stand at the show this year as it means someone has to constantly be on hand. It comes back to the issue that we pay the same price as you to go so we don't want to work all day.
Trade stands & Autojumble
I have always thought this was a let down but it's solely in Santa pods hands.
In closing, I have been talking to Iain about next year and there are a few things we are thinking of.
1. No cars in the gazebos, These will be used as a hospitality area out of the sun with a table and camp stove so people can have a cuppa and a chat. Maybe we could incorporate the guest book into that?
2. Large flags and a couple of big banners. We need better advertising but these things are not cheap!
3. Show passes to be posted out before the event so it allows the team to focus on the stand. A small charge (£2 per pass) would be charged to cover admin costs and to buy tea bags and snacks for the gazebo.
4. A change of position for the zone stand? We have a large number of cars there and I personally think we have a good case for getting a better area, Maybe the bit the other side of the fire up lane. I will be discussing it with Santa pod and airing my views that if we get 150 passes then give us space for them and also we have a fair few cars going out to run so placing us in an area where we have to drive through the catering is plain daft!
Lastly I'd like to say thanks to all of you who attended, I had a brilliant weekend and it has reaffirmed my passion for my E30 and this forum. 
My biggest thanks goes to Dan325isport who took loads of pictures at the gate and helped me get the car looking reasonable after that hideous dust/rain combo over night.