Thanks for the replies.
Xeron, an auto box has crossed my mind, but I don't know of an auto box that is available for the GTR.
Meggala, I have found a website or two on the TRUST box and read that it is indeed made by Quaife in the UK under licence for TRUST Japan.
Also, the price on that website is the price in Yen from Japan, so any freight costs plus taxes and duties must also be payable, so the price of the TRUST 6 speed (H pattern) will be more like 13K landed.
PS, it's not NX-TIME, it's NXTIME ie next time I often get asked about my non-existent Nissan NX