I believe it's £10 adults, free for children. Practice from 09.30, racing from around 12 'til about 16.00/16.30,  the last hour or so is usually a 'shootout' for the fastest competitors (not us then!)
I must admit, considering just a couple of weeks ago it wasn't going to happen, there hasn't been much publicity to try & gee people up & attract a lot of spectators!
It's a round of the 2024 National Hill Climb Championship .