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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Monday's weather for the east of the region
Damages for so-called "sexting" have been awarded for the first time, in a case involving the ex-vice-principal of a school in Kent.
Monday's weather for the east with Philippa