The Queen has left Number 10 Downing Street and headed to the Foreign Office where she will unveil a plaque.
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Susannah Mushatt Jones from New York is known as Tee, short for auntie, to her 100 nieces and nephews.
The tweet said: "Our lionesses go back to being mothers, partners and daughters today, but they have taken on another title - heroes."
The BBC has agreed to pay for TV licences for viewers over the age of 75, the Culture Secretary John Whittingdale has confirmed.