There is a campsite next to the Holman Clavel Inn called Holy Bush Park it is a bit of a caravan / touring set up but may serve your needs. The Exmouth Exodus route provides a good route from Bath to the Blackdowns and could easily include Glastonbury. You could ignore Blagdon hill and use Corfe hill instead to get up onto the Blackdowns. There would be plenty of wild camping in the woods at the top of either Blagdon hill or Corfe hill
There is a campsite next to the Holman Clavel Inn called Holy Bush Park it is a bit of a caravan / touring set up but may serve your needs. The Exmouth Exodus route provides a good route from Bath to the Blackdowns and could easily include Glastonbury. You could ignore Blagdon hill and use Corfe hill instead to get up onto the Blackdowns. There would be plenty of wild camping in the woods at the top of either Blagdon hill or Corfe hill