Ok, I give up. Looks like it isn;t going to happen again this week. I asked support to set up the game for us, but they are saying they can;t do it. They are also saying they cannot re-create the error I am getting, which is very annoying. I have now sent them the log files they requested to look into the matter.
That said, if anyone wants to have a go at setting up the game (no idea if it will work or not) it's pretty easy to do and I will make you admin to do so, but I set off for work in 25 mins, so you will have to be quick.