One in ten Britons "do not know who his real father is"

Genetic testing has revealed that about 1 in 10 Britons is mistaken about the identity of his real father.

Some experts believe that four percent of the population does not know that the man he calls "daddy" is actually not their biological father.

However, Ian Cumming, director of Health Education England, estimates that this figure could reach 10% during a presentation at the Hay Literature and Arts Festival in Wales.

He said, "If you look at people who have had genetic testing in their family for reasons other than trying to determine fatherhood, your father does not represent the one you believe."

Genomic tests allow doctors to screen patients for diseases such as cancer or Alzheimer's disease and to take preventive measures.

According to the Telegraph, the NHS performs approximately 220,000 tests each year in England and Scotland.

But the tests revealed some delicate family secrets and the hospitals were faced with the ethical dilemma of knowing what to do with them.

Professor Cumming said, "Are we going to tell people, 'It's not your father' – or are we going to keep this information for ourselves? I do not think that would be ethically acceptable. "

It is unclear how many people – if any – are aware of their true lineage.

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But the ability to detect serious diseases also leaves health professionals wondering what would be the right moment to inform them.

Professor Cumming added, "In the next 10 years, we will probably do the complete genome sequencing of 100% of the population that wants to do it.

"It's going to start giving us all kinds of information about the likelihood that people will develop particular conditions, particular diseases.

But it's not without controversy, if we can predict that a person has an increased risk of developing bad cancer, when told?

'Do you tell their parents when they were born? Do you tell them when they are 12, 14, 16, 18?