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In the 1960s, when Didion and her husband, John Gregory Dunne, lived on the peninsula in a Spanish-style gatehouse, Didion observed the “slump of the hill” making its strange descent into the ocean.

According to its report, Queen Elizabeth was seen "pacing casually" with her sister Princess Margaret on the road by the gatehouse to the castle when the president drove up with Prince Philip just before noon.

It was subsequently expanded with a gatehouse, reception hall and display room by Norman Shaw in the following decade.

A security gatehouse would also be fitted at the new entrance.

Inside the gatehouse, a large courtyard provided space for weddings, funerals and celebrations.