I checked the Cambridge website. Not a lot of folk music!
my conclusion long since, and Shrewsbury are aiming at Cambridge Territory (official - from the organiser).

The bigger you get the smaller the residual market. So they go after other markets hoping the faithful will hang on. That's what happens when it is run by business men (and menesses). Glastonbury called themselves a Folk Festival once.

Towersey seems to buck the trend (mostly) but then Steve Heap's pedigree is as a Morris dancer who became a business man. I know the route for other organisers is far more cynical and the Folk pedigree rather thin and mendacious.