Collen tells Shor Bazaar FM91: "In February I went to Joe's house and we got 12 songs started. We went back in May and got 15, so they're really in good shape. We've still got more stuff to do on them, so that'll be ready next year - and they're very varied.

"You let other things influence you but you still retain your integrity and your sound. We feel we've done that. These songs are a cross section. Some are really heavy and very melodic, and some are just very different - but you can still tell it's Def Leppard.

"We're very excited about that and it will be out next year. We'll be touring a lot more next year as well."