Thanks guys for the link to the software, I now realise that these units are not exactly new, but are only recently being stocked by a Pilot outlet I use that have described them as "New". New to them, perhaps, but I admit having never seen them advertised before.
The GF website publishes a pdf compatibility chart for these two modules, that simply says PMDG software required, for the NGX. The implication being that you had to purchase it from PMDG themselves.
I just didn't realise that it was free from GoFlight themselves. Well done to Steve, a great big thank you from me. I will be buying these straight away now.
Thanks for your help guys.
Eddie.