Hey, I think it is always sold out, but Boom Town is the best festival in UK, very diverse with its musical selection, great atmosphere and just a gem;] As well Green Man if it's still going, just across the bridge in Wales, Secret Garden...Oh been so long since I left, so might be a lot more now, but these are quite well known and established, there are plenty of small more intimate festivals out there. Good luck enjoy wherever you go, have a dance for us in the southern hemisphere;]