The Charlatans are to play a one-off gig on a tiny fort in the middle of the sea as a festival warm-up.

Tim Burgess and Mark Collins will perform on privately owned Spitbank Fort, recently converted to an exclusive venue about one mile from the coast of Portsmouth.

The show is a warm-up for the Isle of Wight Festival and to celebrate 15 years since the indie rockers released their Tellin' Stories album.

Tim said: "One-off gigs are often in pretty cool venues but this might just top the lot: a fort in the sea to keep Napoleon out. I had to look it up and it's even crazier than I'd imagined. Mark and I can't wait. Who'd have thought there'd be somewhere between the mainland and the Isle of Wight Festival?"

The gig on June 21 is organised by Absolute Radio which will broadcast the event and interviews with the band.

Breakfast show host Christian O'Connell said: "What better way for Tim and Mark from The Charlatans to celebrate 15 years since Tellin' Stories by performing on a private fort in the middle of the sea. It's what rock-n-roll dreams are made of."

The Charlatans will go on to perform at the Isle of Wight Festival that weekend, which is being headlined by Tom Petty & The Heartbreakers, Pearl Jam and Bruce Springsteen & The E Street Band.

Spitbank Fort took 11 years to build and was completed in 1878. It was one of three forts built in The Solent - the water between the mainland and the island - to repel a possible invasion by Napoleon in revenge for defeat at the battle of Waterloo. The fort, which can only be reached by boat, is now a luxury venue featuring Champagne bars, a roof-top hot tub and sauna.