Only fairly trivial issue I had not though of at all was the radio. In Japan transmissions are between something like 76 and 90, so on the Japanese radio I could only get radio 2
. The Jeep radio can easily be replaced with a normal DIN type, might not be so simple on something with bespoke set up. You can buy frequency shifters for about £10 to address this, not sure how well they work.
Speedo primary calibration will be in Kph, if you are lucky it will show mph as well. If not you can get replacement cards in mph for most. On some vehicles You may even be able to have it reset in the software.
You may find that your insurance gets loaded, especially if it's not a vehicle that was ever imported to the UK, parts availability etc. Mostly this will only be an issue with things like body panels that are unique to the vehicle, but I am guessing may also apply to things like the windscreen.
Most service parts will be from the manufacturers parts bin and shared with other models.
Also worth noting that you will not be able to order parts based on the registration number. If the local motor factor puts the UK reg of my Wrangler into his system all it tells them is that it's a Jeep, no other info. It appears that in most cases the days are long gone where you could just ask for an air filter or whatever for a such and such year Wrangler 4litre, most systems now insist on a reg to return any results.
So I suspect I'm some cases you will be obliged to go to a dealer for some parts, but you can probably Google most stuff and find a UK available part, certainly for things like filters, brakes and so on.
The owners manual will be in Japanese, so you may need to try and find an English one, assuming of course that your particular vehicle was ever exported to an English speaking country.
But the Japanese drive on the correct side of the road, don't use salt, don't tend to do big milages and tend to look after their cars. So my Jeep 22 years old 70k miles and looks pretty much like new inside and out. Even nuts and bolts on the chassis still have their original plating.