You will need to select the BABICM event, enter their details and use the code BABICM25 to discount their parking to £0.
Alternatively on the day of the you can use any of the parking kiosks around the venue, using the same code above to discount their parking. Please note this must be done just before exiting the arena, if it is done prior to this attendees parking will not be validated for the remaining time they are onsite.