I have not got greenfield, but when I had my campsite assessment, the assessor was looking for a safe and well laid out site, a well planned programme and a plan B! He also spoke to the Scouts and wanted to know if they were happy, what they had been doing, if they had helped to set up the site, what they thought they had learned.
He spoke to the other more experienced leaders to ensure that what he saw was what usually went on not just an on the day special.
I made sure I knew where the doctor, dentist and hospital were also the nearest working phone/box in case mobile went dead. I showed him the menu (themed!) and the planning. We also got the Scouts to feed him, which I think helped... he was welcomed with a cup of tea and was offered frequent refills.
Hope this helps, but there are far more experienced campers than me out there who can help with the greenfield aspect of it.