England's 'largest gold nugget' discovered
The biggest gold nugget ever found in England has gone up for auction - but its origins remain a mystery.
Metal detectorist Richard Brock was using a machine that was "pretty much kaput" when he found the lump of precious metal, shortly after arriving.
The nugget has been valued between £30,000 and £40,000 ($37,743 to $50,335), but failed to sell at auction, although there is hope it will still be sold.
Video by Howard Timberlake
Interview filmed by Ben Godfrey