On Sunday 2 April, 1911, families across the country completed long and detailed questionnaires about their living conditions, occupations and fertility in marriage – making that year's census the most detailed, some might say intrusive, since records began.

"It was a radical departure from what had come before," says Audrey Collins, a family history specialist at the National Archives. For the first time, the census asked questions about marital fertility, and the nature of occupations.

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