Time for an update on this

First, the symptoms.
Both keys will lock and unlock the car remotely without problem, both keys would also start the car before the fault occured.
Once unlocked and door opened, the dash displays the mileage as it should, but the gear indicator is a black square rather than the usual 'P'.
Insert the key and turn the ignition on, all the dashboard lights illuminate, after 2 -3 seconds the airbag light will go out, all the other lights remain on. I can hear the fuel run of a couple of seconds.
Foot on brake does not release the gear shift from park as it should.
Turn the key to start, nothing happens, no clicking of a solenoid or anything, dashboard lights remain on.
Return the key to the on position for several minutes waiting for the fan to spin up but this doesn't happen either.

As I mentioned above I took the cover off the RCM and the two relays mentioned both operate as expected.

I have been trying to follow the advice given by @red_2005_convertible above but am struggling as I don't have wiring diagram and can't seem to find one.
I also read the 'pulse module' thread here which is a bit of a mess but @1sweetride seems to have similar issues but never returns to confirm if he fixed it or not.

Anyhow long story short if anyone can offer any advice I would be truely grateful and all ears!
Happy new year!