Founder of indie label Sonic Cathedral, Nathaniel Cramp (pictured), has hit back at the Entertainment Retailer's Association (ERA) and Universal Music, who have both criticised his protest against Record Store Day 2015.

Ahead of this year’s RSD on April 18, Sonic Cathedral and partner label Howling Owl said it's been “co-opted by major labels” and that rules around minimum pressing amounts leave small independents unable to participate.

Said an official statement: “This is a protest of what Record ...