I'm by no means a track day fan yet, maybe one day
What I can offer is this -
http://www.vboxmotorsport.co.uk/index.php/en/products/video-loggers/video-vbox-lite
Seeing as I work there I have a complete kit to loan out to someone if required. There's nothing to pay other than shipping to and fro.
Unless I came along for the jolly and helped fit it in?
Any chance we could borrow that for Bruntingthorpe in August please? Does it take a lot of setting up? I'm wondering if we could move it between cars or whether it would have to stay in one? I'll volunteer mine if the latter!