Check in for campers is between 2pm and 8pm (9pm on a Friday) on your day of arrival.
If you have rented a Nomadic Bell Tent, Glamphouse or Bunktent check in is between 4pm - 8pm (9pm on a Friday).
Camping, Bell Tent and Glamphouse check in are all located at the Pavilion which is the large white marquee in the middle of the camping fields.