Hi Peter, I have the same problem with my '98 RX300 Harrier. I am taking the car to a dealer next Tuesday for a service and the engineers have agreed to look into this for me and perhaps test an english CD. My understanding is that the menus will remain in Japanese, but you should be able to select UK destinations via the sat/nav; that is, of course, if it works!! Have you got your TV converted from NTSC to PAL yet?
Regards
Joe