Caribou, like Sigur Rós, are London exclusives. Calexico, Matt Corby, Cat's Eyes (The Horrors Fais Badwan and soprano Rachel Zeffira), Tinariwen, Nathaniel Rateliff & The Night Sweats, and loads more have also been added to the bill.

As well as music, Citadel promises an eclectic array of food, drink, theatre, sports, arts, talks/debates, fun, games, family activities, and much more.

Citadel 2016 takes place at London's Victoria Park on Sunday 17 July.

For more information and ticket details, head to the Citadel website.