Hmm. Lots of second-hand Japanese cars are imported into the UK - the auto emissions standards are much tighter there than in the UK so when they are no longer allowed on the Japan roads but still capable of lots of activity they get imported to the UK and sold on. Wouldn't personally want one that had been running around the hot-spots near Fukushima - I would think that as well as the engine air filter having trapped lots of particles, this stuff would be all in the heating, aircon and ventilation pipework and filters. I saw a lot of recent imports at a local dealers just this wekend - these were Mazda Bongos, which can be used as a 'micro RV' and they were being looked over by people with young families. Still I am sure we can trust our governments to ensure that due care is taken over this issue, as they have already demonstrated. We have a good radiological protection system in the UK (I think - not sure if this has been sold off in the govt's fire sale) so they are sure to take care of it...
Rob.