Does anyone know if it is possible to buy a GPS module that works with the NR70V in the UK?
No, it's only available in Japan for Japan only. From what I understand there is no intention by Sony to expand it to other markets. There was a rumor that something third party was in the works but, don't hold your breath. Sony keeps it's interface proprietary.
Larry Winward T|T3 + SE T610 + SE HBH-65 = BT Heaven!