Jonny,
With respect this is a discussion forum and as far as I can tell the thread has achieved what you wanted. Of course it has expanded beyond the original (desired?) discussion but it is far from off topic.
I speak on behalf of 10/10s when I say I am pleased you have found some entrants.
That said IMO £1000 for 40 mins racing is a bit steep when you can get the same for around £350 to £500 with other organisers. And the TV coverage means very little to me or I suspect most people.
So I wish you every success and as I said, having been there and done it, I have no plans to return.
I hope you get all the entries you need. And this thread will continue as long as we have something to discuss on the topic.