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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Low levels of pollen today and tomorrow.
Cloud will build up from the east during the evening bringing intermittent rain.
Further outbreaks of rain are expected, perhaps heavy at times.