The Queen has officially opened the BBC's new Broadcasting House building during an address on Radio 4.
She said it was a "great pleasure" to visit the BBC and see it "in its new home", and also reminisced about previous visits she had made - both with and without the Duke of Edinburgh.
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"Africa is very important for the United States."
The incident happened at around 8pm local time on Thursday evening.
The Foreign Secretary said "good connections" were important, and suggested the Channel Tunnel might simply be "a first step."