Prince Harry was greeted with cheers as he started his first official visit to Australia.
The prince is representing the Queen at the International Fleet Review in Sydney, which features around 40 warships from 17 countries.
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The Duke and Duchess of Cambridge met young people who have battled mental health issues on Saturday.
Former Chancellor Lord Geoffrey Howe was Margaret Thatcher's longest-serving Cabinet minister, also taking on the role of Foreign Secretary.
Lord Geoffrey Howe is known by many for his resignation speech which was seen as the catalyst which destroyed Margaret Thatcher.