Hi and welcome ..I just bought a JDM Z a few weeks ago ,no problem with imports just check the usual things as you would any s/h car., best if you can find one with Jap history,usually the jap imports have done very little mileage compared to the UK sourced cars,and usualy the bodywork is in better condition (I dont think they use salt on Japan,s roads !! )
All you will have to factor in to the price is getting the speed limiter removed (if you want to ), the radio requires replacing or fitting a band expander..all other work will have been done to get it legal on Uk roads to get it through the SVA test..assuming you buy a car already registered in the Uk.. probably more things but thats all I,ve come across up to now Cheers Tim