Marcus Mumford has no hesitation in lavishing praise upon producer Paul Epworth for his work on Delta.

The multiple Grammy winner and three-time BRIT Awards Producer Of The Year holder, who has collaborated with artists including Adele, The Stone Roses and Rihanna, has worked with the band since Easter.

“He might be the best producer in the world,” says Mumford. “He’s felt like a mate as well, it hasn’t felt hierarchical in any way. Everyone’s idea counts, everyone gets a ...