Another website that I use for cross-checking suggests Honeysuckle Homestead (£24 for EHU) and Stonehenge Campsite & Glamping Pods (£25 for EHU). The 2 others are more than your other £30 (Brickyard Farm & Shaftesbury County Touring Park).
I haven’t checked distances.
Thanks Fiona, yes, Wylye. I put a query about Honeysuckle Homestead. Stonehenge is a"proper" I e. Commercial site, stayed there once years ago. May be worth a look.
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Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.