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.
More top news
One of Clandon Park's most historically important rooms has survived the fire that gutted the rest of the 18th century mansion.
The party has suspended Robert Blay. He was caught on camera saying he would shoot Ranil Jayawardena, his North East Hampshire rival.
Wednesday lunchtime's weather for the east of the region