I have a theory!!!!! And yes, someone else told me !!! lmao

I'm going to run an earth strap from the box to the chassis direct - apparently this is prevalent in many other cars but not on mine ... getting the wiring covered in water, mud and crud over time has the ability to play with it as such, and apparently the solenoid lockup voltage is similar to the dizzy module only needing around 5 volts with only a mild change to this (plus or minus 10%) being able to cause issues ...

It's a wild one, but I'm going to try it and let you know ...

My shudder whilst cold is not the TC as it turns out - its the seal. When cold, it's letting oil through until it heats up and expands - hence only shuddering when cold due to loss of oil pressure ... hopefully that simple, and again, I'll let you know so all the info is on this thread ...

Still ... I LOVE my auto!!!!