Open track are useless, you'll be queueing all day to get on track!
Little heads up about this, just done the whole day without a single wait or queue.
I mentioned about the queueing problem at one of the days, the guy who runs opentrack said the reason behind this was that 25 caterhams booked themselves in for that day, and they hardly ever came in off track, meaning the numbers seemed to high. Apparently all caterham keenos are now banned from his days due to this.
Couldn't recommend the company enough, free refreshments, free photography, wouldn't hesitate to go on another day again at all.