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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