A Newport man has visited a landfill site in south Wales hoping to find a computer hard drive he threw away which is now worth over £4m.

James Howells' hard drive contains 7,500 bitcoins - which is a virtual form of currency for use online. This week, a single bitcoin's value hit $1,000 (£613) for the first time, making his collection worth $7.5m (£4.6m).

BBC correspondent Hywel Griffiths spoke with Mr Howells about what happened.