Queen Elizabeth II is now the world's longest-reigning living monarch, following the death of King Bhumibol of Thailand.
The Thai king passed away today aged 88, bringing to an end his reign of more than 70 years, which began on June 9, 1946.
The Queen became Britain's longest reigning monarch in September last year, having reigned for more than 63 years.
She ascended the throne on February 6, 1952 and her coronation took place on June 2, 1953.
Her long reign was marked with the creation of the Queen's Walkway in Windsor, which Her Majesty officially opened on her 90th birthday in April.
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The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.