If your Comand screen hides away when switched off it's NTG4. If it's permanently on display it's NTG4.5. Assuming you DO have Comand, not Audio 50/20!! You have to check the option codes via the VIN number - if they're not listed in the front of your owners manual, there's a thread on here specific to requests for options fitted via VIN number.
Hi thanks, mine does not go inside dashboard when switch off, so am I correct in thinking its a 4.5 then, I will check manual to see if I can confirm that