They usually have “on the field” parking (it’s a big place) – be sure to join the correct queue on the way out, otherwise you can spend hours in the narrow back lanes trying to get back to Redruth for the A30.
And it’s the only show I’ve been to with a grandstand, which is very welcome – I think it’ll be a fairly modest price for a seat, payable on the day.
Blue Badge holder (disabled) cars get very good access too.