You're in for a treat!
No rules really, don't be a d*ck... That's about it! Very chilled vibe. Own food and drink welcome but vendors and bar are varied and reasonable so worth supporting. Wristbands on entry, wristbands to get in from the camper fields, no particularly strict security in the past. Have fun!
I think if Glasto hadn't been on a fallow year in 2006, they'd have been a really solid shout - Playing the Angel did decent in the charts, as did lead single Precious, they had a big old crowd at Wireless Festival (back in it's pre-pop/rap days ofc) and Violator/SOFAD/Ultra material was still reatively recent.
I do ponder if the moment has passed, even if in all likelihood they'd do a job if asked. Though I can't recall if they were that positively received at Isle of Wight Festival when they did that on the Sprit Tour.
Saying that, Just Can't Get Enough's continued presence as a football fan soundtrack means it might still have some recognition with that crowd.