The latest phase of the upgrade to Rolls-Royce's Raynesway factory in Derby will officially open later today.
The firm secured a £1 billion contract from the Ministry of Defence in June to build reactors for the next generation of nuclear submarines.
Atlantic House will be officially opened by HRH the Duke of Kent.
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A windy day with some possible rain.
It will be a cloudy day but remaining dry.
27-year-old Akim Nicholson has been arrested by police following a five-hour rooftop standoff during which officers were pelted with tiles.