Are there any good rock concerts which still have tickets available in U.K. this summer during June and July?

I like coldplay, radiohead, Jessie J, Gorrilaz, and many other British bands. I really want to see one during my trip to the UK this summer, but I don't know which rock concert are worth going and if they still have ticket available. Please let me know if you have any infos on this. Thanks a lot!!