When Brian Williams has his hair cut by his wife every month, he's not the only one who feels the benefit. His wife Joan collects the clippings on a sheet and shakes them out into the garden - where the birds then pick them up to make nests.
Mr Williams, 68, a retired teacher, was astonished to find that a goldfinch, a greenfinch and a robin have all collected his grey locks and used them to build homes in his garden.