A man whose son died after playing computer games is campaigning for greater awareness of the risk posed by their excessive use.

Chris Staniforth, 20, who would played his Xbox for up to 12 hours, died in May from deep vein thrombosis (DVT). His dad David believes the condition may have been triggered by long gaming sessions and is caused during long periods of immobility.

The coroner said a clot formed in Chris' left calf before moving to his lungs. Once there, it caused a fatal blockage, known as a pulmonary embolism.

Staniforth said there was no difference between his son sitting at a desk on his Xbox and someone on a long-haul flight. He thinks that sitting still is literally the danger zone and millions of people worldwide are playing these games for hours, and there is a risk.