What caused Britain's Bronze Age 'recession'?

A large gap in pre-history could signal that Britain underwent an economic downturn over 2,500 years ago.

In history lessons, the three ages of pre-history - Stone Age, Bronze Age and Iron Age - seem to flow together without a gap.

But there is a 300-year period in British history between around 800 BC and 500 BC where experts still struggle to explain what happened, where bronze is in decline and iron was not widely used.

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