The world watched on television as flames tore through Windsor Castle's fortress, parts of which are almost 1,000 years old.
Priceless artwork was at risk and so were stately rooms, some of those were destroyed and a large restoration project followed.
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The 47-year-old man died shortly after 3pm on Tuesday.
Specialist explosive detection dogs searched through the town examining letter boxes and phone booths for signs of potential devices.
Temperatures reached 29.1C in St James's Park, central London.