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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The estate agent renting out the property claim there's been lots of interest.
Cold, dry and sunny
Mostly dry and sunny after a frosty start