I took the cluster out tonight just to make sure there wasn't a connection issue and also changed the 5amp fuse (no. 9 for E46) and still no joy.
I'm not familiar with NavCoder and don't have an IBUS interface tool so before I splash out €60 for both these things can someone confirm if, using NavCoder there would be an option to activate the stalk controls?
The person I bought the Nav components said he would code the Nav to my car based on the last 7 digits of my chassis number.
The only other connection I made during the install was the Blue / Yellow wire to the fusebox as per this -

Maybe re-doing this connection might resolve the issue?
Any help greatly appreciated