I believe that it is the ews that provides the starter inhibit.
It receives a signal on a pin to indicate the car is in park, and if that signal is present (along with the rest of the immobiliser inhibits) then the car can turn over.
On a manual this pin is not connected, and the ews is programmed not to check the state of this pin. This programming can be done using Toaf - may be worth checking to make sure the ews does not think it is a manual.
I don't have the wiring diagrams to hand to check where the signal to the ews originates though.
Hope this helps
Chris
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