I agree that in a year of good weather any 'official' folk festival campsite would be hard to beat. The pity at Sidmouth is that the site is inherently unsuitable for camping - it has quite a slope over much of its area and the ground rapidly becomes waterlogged. In contrast, Towersey is broadly flat and, being on more chalky ground, it dries more quickly if there is rain. The view from Sidmouth festival campsite on a good day is second to none. There is a report in the local Sidmouth paper about the 'fringe' festival at Thorn Park campsite - I'll copy it to my webpages shortly.