Based purely on the fun-factor, (and aided by being down-the-front!), rather than who did the greatest performance…
In chronological order:
Status Quo - Acoustic - 2017 (so much fun!)
Bananarama - Avalon - 2019 (loved Kylie too, but prefer smaller stages, so more fun here!)
Reef - Avalon - 2022
Paul McCartney - Pyramid - 2022
Pet Shop Boys - Other - 2022
Sparks - Park - 2023
Rick Astley + Blossoms - Woodsies - 2023
Guns n’ Roses - Pyramid - 2023
Neville Staple - Avalon - 2023 (ran to this when Elton finished, way more fun!)
Lulu - Avalon - 2024 (shame her set wasn’t televised - she was brilliant)
I’m sure Kasabian at Woodsies 2024 would have been on the list if I hadn’t been stuck at the side, unable to see the stage!
Special mention to this band who I stumbled upon randomly and loved instantly:
Sleaze - Strummerville - 2023
Jimmywe has said the same a few weeks ago. Wouldn't be a great look for the organisers if this was the case. Suppose there's a chance the 🤔 emoji they put on instagram could have been alluding to have not being booked again.