I managed to sort out this problem by duplicating the working leg through the layer manager. It seems to work fine now.
I have also created the spline IK spine , neck , and tail as suggested.
They seem to work fine but the bones stretch at the moment which is something that I will have to sort out aswell
I have also created some muscles aswell. They are not attatched yet. Im not quite sure what stage I should attatch them at :s
Next I am going to set up an IK FK blend for the legs and set up some foot rolls etc