Thanks for the welcome. Yes, I did suspect that insurance could be high. I've also assumed that to make it road legal for UK the rear lights will have to be re-wired. Here in Japan we don't have separately operated fog lights. All the red rear lights are linked to the foot brake and I imagine that, in the UK, the two stand-along rear lights get re-wired as fog lights. The speedometer will have to be changed too since the mileage is recorded only in km and the speedometer shows only km/h. My local agent is Tokyo is getting me a quote for the cost of transporting the car and making it street legal in the UK but I may give Lexus Hadleigh a call anyway for that part.
I've seen a few other posts regarding the navigation system. I am not surprised that it would have to be replaced completely. It would be too much to hope that one could just put in the DVD for England and have everything work! When I got my car I asked for English manuals as well as the Japanese language manuals. The English manuals given to me were for US Lexus models and the navigation system is very different. I have no experience of navigation systems in England but I'd be really lost without it here in Tokyo. The Japanese one lets me find my destination by address or by telephone number (public buildings). The TV is also good - even featuring a language selector for bi-lingual TV broadcasts, but, as someone else points out elsewhere on this site, Japanese TV is NTSC so it won't work in the UK anyway.
