The project began four years ago, he says. "We started by meeting in the studio and playing through demos that had been written by the band members. But the future of the band was always going to be decided by whether Barbara would be able to tour again.

"Her Parkinson's progresses and the medication becomes less effective, so she stops playing. Then a new medication arrives and she picks up where she left off. It's happened three times now, and recording was stopped in 2012 because it looked as if she'd never play again.