Grunge music festival

[chachachachachanges]

DC are teens. I'd like to take them to a music festival this year. They adore 90s style grunge. They abstain from almost all other music.

Looking at this year's lineup, Reading Festival seems to have turned into a pop concert somewhere along the line since I went last many years ago. Download is too hard metal/rock.

Any recommendations?
Anyone been to Rebellion festival in Blackpool?
We are in London

Ps long time MNer under fresh username