Because the bags are not bio-degradable it is a fair bet that some of them pre-date the Republic of Ireland's plastic bags tax, introduced 11 years ago.

BBC: Northern Ireland bag levy could reduce litter

Items also declared treasure by Norfolk's assistant deputy coroner David Osborne included an Anglo-Saxon silver pin found in Scoulton, a Middle Bronze Age Gold Bead discovered in Salthouse and a hoard of 59 silver Roman coins that date from the Roman Republic to Tiberius, the second emperor of Rome.

BBC: Roman gold coin revealed in 'lucky' Norfolk treasure find

It is one of the largest capital investments for a Sino-foreign joint venture project to date in the People's Republic.

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