An additional 14 acts have been named for the Metal Hammer sponsored festival, which takes place at Newark Showground, Nottinghamshire, on July 9-12.

Garrod says: "Tech-Fest 2015 is looking to be our biggest event yet - we're excited to be working with all the great sponsors from last year and going back to the Newark Showground for our fourth edition. Many more bands, workshops and after-parties will be announced in due course."