Classics organisers have brought the age qualification back to 25 years for all vehicles, other than motorcycles and scooters - 1994 or older.
As in all previous years, they will allow some special exotics to add colour and flavour to the event. There will be no age restriction for motorcycles and scooters.
Pre-booking is essential for all vehicles.
Milehams Discount Car Care will be on Harpenden Common to support Classic Cars.