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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Showers becoming heavy and thundery this afternoon with sunny spells in between. Breezy along the coast.
Sunny spells and heavy thundery showers this afternoon.
Weight of people trying to sign caused government petition to website to crash as Europhiles try to force a rerun of the EU vote.