It is thought the redhead gene is caused by an evolutionary response to lack of sunlight and vitamin D in Scotland, Ireland and the north of England.
At present just 1-2.
Another unnamed scientist added: "I think the gene is slowly dying out. Climate change could see a decline in the number of people with red hair in Scotland."
Whatever the weather (pun totally intended) present day redheads need not fear they will suddenly be made extinct. But if that day ever comes we guess there's always the dye job... Unless climate change interferes with that too.
But for now, we can still bask in the light of our favourite auburn tints be they out of the bottle or totally natural...