MORE groups have been added to this summer s Sonisphere Festival at Knebworth House.Gutsy rockers The Wildhearts will take to the stage at the Hertfordshire stately home on Saturday, August 1.Ahead of their upcoming UK tour, they have chosen to join the

MORE groups have been added to this summer's Sonisphere Festival at Knebworth House.

Gutsy rockers The Wildhearts will take to the stage at the Hertfordshire stately home on Saturday, August 1.

Ahead of their upcoming UK tour, they have chosen to join the line-up at the legendary home of British rock.

Meanwhile, over on the Bohemia stage, and fresh from their Download Festival appearance last weekend, Brighton noise merchants Architects will be tearing it up with their vicious blend of fast jagged rhythms, complex guitar work and aggressive vocals.

Drummer Dan Searle said: "We're so stoked to play Sonisphere! The line up is amazing and we're really excited to be a part of it."

York metallers Glamour of The Kill are also playing and hotly-tipped Fact have been added to the bill for their UK debut.

The inaugural Sonisphere Festival at Knebworth will be headlined by Linkin Park on the first day, with Metallica closing the event on Sunday, August 2.