Billy Gregson, aged 10, of Leeds, with his brand new bionic arm. A schoolboy will achieve his dream of being able to cast his own fishing rod with his dad after being fitted with an incredible bionic 'Iron Man' arm thanks to a huge donation. See SWNS story SWLEbionic. Billy Gregson, from Bramley, was born with an upper limb congenital deficiency, with his right arm shorter than his left with limited movement. Courageous Billy has grown up hoping that his arm would grow so he could "be like his friends" - but it never stopped him pursuing his hobbies of fishing and clay pigeon shooting with his dad Mark, 54. While researching potential options which could help her son, Billy's mum Donna, 49, came across OpenBionics 'hero arm'. The new bionic arm uses sensors within the casing to allow the recipient to respond to movements and are designed to have all of the same functions as a usual pair of arms.