When I went into the office today (above) the best advice I was offered was that those who wish to be together, should apply together. Obviously they were incredibly busy with everybody seemingly on the phone and their pc's at the same time! I'd be more comfortable clarifying this once the ticket confirmations have gone out as they'll be a bit less busy. However, my own suggestion would be that everybody downloads a copy of the form, fills it in, then sends it to one person per campsite and that that one person sends the whole lot in one envelope. It's going to be pretty much the same as the grandstand seat system, I guess; they'll just allocate pitch numbers as they process the orders.
The alternative of course is to see if they would be open to allocating a specific area of a campsite to us on a more formal basis but that is fraught with dangers if people change their minds as the year goes on and we need quite a commitment up front. It could also lead to some controversy as to where that should be! Food for thought.