When Katie was just a child, her tics were so relentless they left her bedridden with a sore throat for two weeks.

The now 15-year-old says living with Tourette's affected her ability to sleep, eat, and caused her to miss school.

But a wrist device developed by researchers in Nottingham helped her calm down in an "instant".

Katie recalled trying it on for the first time, and said: "It was absolutely life-changing. It was like the best day of my life."