The MerseyGirls emotional reunion with Simon Cowell

When we first met MerseyGirls in 2017, scoliosis sufferer Julia thought she'd never be able to dance again. But with the help of Simon Cowell, she was able to get crucial surgery in America so she could dance forever. Their triumphant return to BGT: The Champions will be the first time they have performed in front of Simon Cowell since Julia learnt to walk again...