The turbo parts went back together smoothly, and revealed the manifold to wastegate leak is worst than first thought. When off, the wastegate seemed to be pretty loose and jiggly too. I’m treating these issues as good news, however, because they are consistent with the cars lack of low/mid range torque.
I have ordered a new Turbosmart ultragate38 from GCG Turbo. The assumption has been made (perhaps stupidly) that it will be a similar physical size to the cheap item currently fitted, allowing a speedy install.
Whether it brings the car to life or not, time will tell. It is an exciting question.