Sorry to keep you in suspense, E_T_V. I was hoping to find out more from the NSVA's Forum, but it seems to be a bit sleepy at the moment!
As for how to get there, it's just a case of going on the M40 and turning off junction 15 of the M40 and heading on the A46 towards Coventry. Take the first exit off the A46 and follow the signs.
It should not cost anything to turn up at the show, but having said that, I am only going on what it was like for me last year. I only went up on the Sunday, and will be doing so again this year as I have other commitments the day before.
This event is a Swapmeet, so if you have a lot of parts to sell, take them with you, as I will be taking bits up, possibly all the Maestro bits if there will be any of you guys up as well!
I shall get more info as soon as possible.