On 20th November 2012 it will be 20 years since the Windsor Castle fire. The castle is the world's largest inhabited castle and is one of the official residences of the Queen.
The castle was severely damaged in the fire, which destroyed some of its most historic parts.
It took several years and a lot of money to repair the building.
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The plaque at number 16 Cowley Street in Westminster marks the brown brick Georgian townhouse where Sir John lived for 31 years.
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