Women will be able to tell the exact moment they are most likely to conceive thanks to a new skin patch.

The device measures the tiny changes in body temperature which indicate when ovulation occurs.

It is far more accurate than any current system and could save the NHS - and individual couples - a fortune on unnecessary fertility treatment.

The patch, called DuoFertility, was developed by Cambridge Temperature Concepts Ltd, a firm started by PhD students at Cambridge University, and is expected to go on sale later this year.

Chief Scientific Officer Dr Oriane Chausiaux said: 'This is a real breakthrough, and could save couples - and the NHS - hundreds, even thousands, of pounds in unnecessary tests and procedures.'

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