Japan drives on the left, just like the UK, so of course cars in Japan are all right hand drive.
Accordingly there is no point in importing that type of car individually secondhand from the other side of the world, because doing so wouldn't result in a competitive product. On the other hand, sports and luxury prestige Japanese car models are only made in Japan, because they are harder to make and they are not mass-market products in the same sense that the family cars are. Such parallel import cars have several advantages over vehicles which have been in England from new. Japanese cars are virtually always low mileage by British standards, and the mileage can be relied upon, because Japanese dealers are subject to a fierce consumer protection regime. It would actually be pretty hard to find a car in Japan that had done 12,000 miles per year - the British average.