In reply to Neil Williams:
Plenty of the Peak is rural enough for it, keeping in mind the aforementioned eleventh commandment. If no one stumbles upon your camp, and no one knows you were there, does it really matter if you camp up, for example, overlooking Edale? No harm caused, no trace left, no one any the wiser.
In contrast to the gentleman seen a few weeks ago striking his tent...next to the plantation next to the High Neb parking, at 10:00, in full view of every person in the vicinity.