A year later, at the final testing stage last week, the amount of hair lining the crown, temples and decorating the rear of the head, had nearly doubled.

At a number of points over the past 12 months, we had the volunteers’ scalps photographed using a specialist medical camera. The pictures were analysed by skin experts Canfield, and show that, at the end of our trial, both volunteers have a level of thickness similar to that of a person without any, significant alopecia.

The results are remarkable. But how does this treatment succeed where all others have failed?’