Ensus - one of the UK's biggest biofuel makers - has temporarily halted production at its Wilton plant on Teesside
It says the high cost of wheat, which it processes to make biofuel, animal feed and carbon dioxide, means it's not competitive to continue production, but no staff are being laid off.
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Sandiford, a former legal secretary originally from Redcar, was convicted of drug smuggling offences and sentenced to death in 2013.
Durham Crown Court heard that one of the male victims suffered a triple-fractured jaw, while left lying in the gutter, unconscious.