If you can get a copy of friday ad from the 15th june I believe there is a coupon/voucher for free entry for 2 people on the saturday. I can't find a copy but you may have more luck! My friend is riding in the barrel racing challenge at the end of the day Good luck!
Get a free copy of the Sussex Living magazine (picture of pond lilyand leaves on front cover) - their office is in Hustpierpoint now at the corner of South Avenue. You can also get them in the shop opp. called Feathers, The Co-op at the other end of the High Street (other places in Burgess Hill, Hassocks etc and other outlets). Page 83: 2 adults or children on Friday or Saturday but you will have to pay for the parking £8.00 - hope that helps.
Thank you all for your help - hopefully have sourced a copy of the Friday Ads through a kind member on here so will be looking forwards to a lovely day out on Sat - will look out for the barrel racing too ;-) x