Ok, so my fob is being a PITA.
I entered the EKA, it seemed to have worked - the alarm was disabled and I can get in. Central locking didn't activate though.
But the issue really is that even though the alarm is disabled, the immobiliser still won't let me start the car. This is an S reg, so it should be pre-10minutes waiting time right....
What I did:
Following guide entered EKA
Turned ignition, beeping sound.
Right, thought it might be something to do with the code so +1 to the 2nd and 4th digits. Nothing.
The alarm is disabled, but it is still immobilised!?