"The funny thing is they give you these headphones and I chose classical music. It came on and it was the exact music I play to my little kid when he goes to bed. I was in there for 25 minutes. It was horrible".

Commenting on the diagnosis, Gallagher added: "It's an accumulation of many things but I've had a bloody great time doing it all and if I do eventually die of brain disease, it will have been worth it".