Feeder and Taking Back Sunday have been added to the line up for this year’s Sonisphere festival.

Skindred and Frank Turner will also perform at the event, which takes place at Knebworth House from August 1st-2nd.

The festival will feature previously announced headliners Metallica and Linkin Park.

Meanwhile, organisers have announced that under-12s will be allowed into the festival for free, as long as they are accompanied by a ticket-holding adult.

Other acts scheduled to appear include Nine Inch Nails and Anthrax and Airbourne.

(by Jason Gregory)