James Waltham praises this fly in his excellent Sea Trout fishing book. He provides the dressing and shows a B&W photo, but it's not especially clear. He says that it has an underbody of yellow wool and says that some foil from a wine bottle is wrapped along the shank. What I can't tell from the pic is whether the foil completely covers the wool - it looks like that in the pic (in which case, why does the wool matter?), but it's not easy to tell for sure. Anyone shed any light on this / have a colour photo of a finished pattern?