Do Warlords have any info on what constitutes 'proof'?
I don't immediately know that, but I will contact the ExCeL centre (it's the centre's requirement, not the Warlords') to find out.
What's the lowest number of folks you'd run the table with?
If people were prepared to muck in for the full day, then three other than myself would be just about manageable. I'm planning to have much of the scenario set up so it can run without me, in order that I can drop out to talk to people as required.
And I do, theoretically, have three right now. RobSkib is working on arrangements, but will be coming with another player from his circle. (I was also contacted on FB a couple of weeks back, but haven't heard back from them).
Also, I have been sitting on a backup plan that I'm about to put into action and I hope will work to get some extra players. I know that every time Gav Thorpe tweets about anything Inquisitor related, he gets a load of people who say "Hey yeah, I used to love that and I've still got all my old models". So I'm planning to be cheeky and ask him to retweet a help request, in the hope that brings anyone else out of the woodwork.