Thank you very much Michael & Jopo - tried all blends first but found (as you pointed out) the right side didn't fit the way it needed to. Good to know how to use the Iso curve command (in this context). The one attached uses two blends and one network - as I couldn't get the blend on the right side within the profile of the neck. Still working on this but pretty happy with it so far. After blending the middle changed the shape of the back of the neck and used the planer command.