Thank you all for the great advice - really appreciate it. I'm leaning towards going a week before the school holidays in October... so somewhere around 27th Sept for a week.
@Bushcraft - for that time of year what do you reckon about anti-malarials (both for yourself & the kids)?
After phoning around the camps a bit it seems that they'll be happy enough to push a 3 bed unit into a 4 bed unit if we bring along the blow-up bed etc. One very helpful lady at Berg said it was easiest to confirm which units could be bumped at each camp and then do the booking for 3 people at head office. Once done, phone around the camps in turn getting it amended to 4 people.
So I guess the next plan is to figure out which camps to aim for that week depending on availability.
