My main point is I can not connect to the Engine or the ABS or the Airbag. So it seemed unlikely they all had broken wires as i guess they come from different parts of the loom. The common point for those 3 systems is the connector C0286 on the K109 Header (and maybe the earth on the K109).
The Pektron SCU I can connect to, comes direct into the port.
It’s a few days before I get the car back, so I need to find some wiring diagrams which are not obvious to find anywhere so far.