Hi Greg,
I have had our current Disco in Darwin for three and half years, and have resorted to doing my own servicing - and going to the dealership (mitsubishi) for diagnostic issues only. Normally have to wait at least a week to get a booking.
I dont think there is a Landrover specialist other than the dealer. I am contemplating purchasing something to read and clear faults in the very near future, sick of having the vehicle sitting and waiting to get "plugged in" and faults cleared, checked.