Davis penned new song So Unfair about his son's struggle with the condition. All proceeds will go to the American charity JDRF (Juvenile Diabetes Research Foundation), which is working to find a cure for the condition.

Zeppelin, who is six, displayed symptoms including extreme tiredness and lethargy before doctors discovered high blood glucose levels which indicated Type 1 diabetes.

Davis says: "Zeppy has had Type 1 diabetes for now a over a year. It's a battle for the parents, it's a battle for him, it's a battle for everybody. I have to constantly monitor his glucose, I have to constantly hurt him and stick him with needles, and he doesn't understand.

"It's a horrible disease and I really wanna do whatever I can do to make a difference to help find a cure for this. Because it just doesn't affect my son. I feel for everyone who has this disease. It's not fair at all. And so I started writing this song, So Unfair, about it.