Nope it's can messages failure instrument pack 3.
The CANBUS controller is NLA for the NNN100692, and as you point out Rimmer Bros is out of stock of these units.
I have one or two NNN100692SR units on the shelf, and if you would like a plug and play replacement for your defective unit, I can definitely assist or indeed a virgin unit to be coded to the car with T4......and not at Rimmer Bros prices either, as you will be cutting out two middlemen
Drop me a PM if you need to know more.
Brian