After many hours of trawling I spotted a picture of a Bosch Logixx 7 machine whose control panel looked suspiciously similar to my Neff.
Did some research on the Bosch machine and found a thread with instructions on how to manually clear the fault code from the controller if it doesn't clear by itself. Applied this "fix" and all is now working with my original motor.
Just in case anyone ever stumbles across this thread searching for a solution to the reset error in future here's the solution...
As to resetting it once they have been replaced it should do it itself. But if not its as below.
.
Turn the appliance knob to the off or reset position, 12 oclock.
Turn the knob to the 6 oclock position.
Press and hold the spin button and while holding the spin button turn the knob to the 7 oclock position.
Continue holding the spin button for about 5 seconds then release the spin button and now turn the knob to off
When your turn it back on it should have cleared the error code.
Now why didn't I think of that?
"A nation of plenty so concerned with gain" - Isley Brothers - Harvest for the World