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Since then, the under-18 conception rate has dropped by 60% and the proportion of teenage mothers in education and training has doubled.

While a woman's age at thaw has relatively little impact on a woman's chances of success, the age at freeze does, with evidence suggesting that if eggs are frozen below the age of 35, the chances of success will be higher than the natural conception rate as the woman gets older, says the HFEA.

In 1969, the conception rate was 47 per 1,000 women aged 15-17 - in 2016, it was just 18.9.

They say this technology has brought them from a 45 percent conception rate to a 65 to 70 percent conception rate - stellar for a dairy of their size.

Among under-18s, the conception rate has halved in eight years, to 21 per 1,000 women in 2015, data from the Office for National Statistics shows.