I have decided to change the ABS module as my current thought is that one or more of the valves in it are jammed. I have just to check some more of the power to the original unit, confirm that it is at fault and assure myself that I can bleed the new ABS unit when it installed.
I will start a new thread on that attempt at restoring the correct pedal travel.
I will be relying on the DRBIII clone to complete the task.