The Atomic Weapons Establishment is due at Reading Magistrates Court later over a fire at its site at Aldermaston in Berkshire.
A worker received burns when the blaze broke out in August 2010. The company faces three charges brought by the Health and Safety Executive.
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The A27 will remain closed in both directions near Lewes during rush hour due to a large fire at a recycling plant.
Friday morning's forecast for the east of the region
Friday morning's forecast for the west of the region