Green Day are probably one of the more likely older rock bands you'll still get at Reading. If they potentially stick to having 1 older rock headliner you could see a band like them or Foo Fighters (if they keep going) coming back. They're way more relevant to a current R&L crowd than RATM imo
They were really brilliant in London the other day, always liked Green Day but excited expectations for sure, really was just banger after banger