It seems Rolling Stones have teased a UK/European tour on their Instagram page. Maybe they are also a possibility (apart from Macca) for a potential second TW Classic day (or Encore day).
Speculation time again:
Given the recent Glastonbury announcement (and assuming a second TW Classic day takes place), Macca, Foals and Noel Gallagher are all free to play on 26th of June.
If it's Macca I'll definitely do TW Classic. It's likely the last chance to see a Beatle in concert.
He will be the oldest headliner ever in Glastonbury.
Several British papers now reports that sir Paul will headline Glastonbury on 25th of June.
https://metro.co.uk/2022/02/21/glastonbury-2022-sir-paul-mccartney-to-headline-becoming-oldest-ever-16139991/