A devoted father taught himself biotechnology after his baby son had to have his arm amputated.

Unsatisfied with the "cumbersome" options available for children and babies on the NHS, the psychology teacher locked himself in his shed for days on end to make the perfect bionic arm for his little boy.

Arms with sensor technology, according to Ben Ryan, aren't available until children are three or four years old, and he "wanted it a bit quicker than that".