<quietly> there isn't really much uncertainty at this point - we're just pretending there is so as not to spoil the fun for folk who still want to get hyped up for anyone that's not The 1975 / Neil Young / O-Rod </quietly>
So what’s the biggest factor in all of this uncertainty? Dearth of top acts available? Glastonbury not on the ball? Glastonbury £ rates? Acts can earn huge sums on the arena circuit? Too many other festivals in competition?