Just got back from our camping trip, which was my Dh and kid's first, and wanted tor ecommend the site as it was just incredible. The place was called Wood Farm which is on the outskirts of Charmouth on the Dorset / Devon border, Charmouth is great as it is completely unspoilt (great beaches and a must for fossil hunters too), and Lyme Regis and Beer were both nearby too.
The campsite was incredibly clean, friendly, all the facillities were A1 (pool, shower blocks, shop, pitches) and we can't wait to go back next year.
Their website is here:
WOOD FARM