He's taking part in Macmillan Cancer Support's Not Alone campaign, which aims to offer people an idea of how isolated it can feel after diagnosis. Iommi announced he had the disease in 2012 and later admitted he'll never live another day without feeling under threat.

He said in January: "Every day I feel around for lumps and bumps. Every time I get a pain in my stomach I think, 'Oh God, it's cancer.' It's horrible. I even dream about it. But that's my life now."