Apart from the leather you mentioned, the UK cars came with 3 seperate oil coolers. If I'm not mistaken, engine, transmission and diffs. The engine cooler also meant the front bumper design was slightly modified.
Also, I think the UK versions came with a revised MFD, although not the final one made by NISMO. Finally, the dash is slightly different as they removed any instances of the Japanese spec SatNav and CD controller.
Bear in mind the R34 does need the oil cooler especially if you plan on tracking it, so if you don't buy a UK one, make sure you retro fit a good one like I did. There are also debates as to where it should go, make your own mind about that.
I also upgraded my MFD to the NISMO II version, which is better than the UK one also. So in reality, if leather is not your cake (wasn't mine, get thrown about too much on the track) then you could spec up an import version. But beware about spending more on the long run. Although the components I've upgraded are better than the UK versions, expect to pay a little more in the long run.
Warranty is also another issue to think about, but if you buy from Middlehurst (only official UK Skyline dealer) then you will be bound in chains to them, so you can forget about getting aftermarket exhausts through after market tuners.
I've never heard of anyone using their warranty on an R34, so I can't see there being an urgent need of one.
Hey boys, My UK R34 has the MFD2 with throttle and oil pressure and temp? Can't remember seeing voltage though.
Yes, only 3 additional oil coolers.
Also, I have used the warranty for a new battery and a throttle position switch went a little doolaly. RAC came and took the car back to MM and they returned it too.
Also, MM will fit Nismo or HKS exhaust and intakes and with a kind word even let the warranty exist with these additions.
It's a tough call with the leather, personally I wouldn't be without it and even if it's not to your taste I believe Paul GTR34 sold his seats for over £2k? Paul?
Gotta love the 112mph limit being removed but this is a cheap mod to imports anyway.
And, unless your buying a brand new NUR spec (all sold out?) it will be used so CHECK THE HISTORY carefully.
Strange that about the oil coolers.
On the R33 UK car there were four cooles just as Andre describes.
I think the leather interior is excellent but if you are nowhere near six foot tall (there go those nambi pambi british units of measurement again Andre) then you will slip all over the place.
Strange that no one has mentioned price at all which was the original question.
Import about 30K. UK version pricess are asked for anywhere up to 45K but mid thirties ir probably more realistic. I think due to tax law changes there may be a few people who are not commited enthusiasts of the car off loading their 'company car R34'.