Majority of Fit imported commercially into UK are over 12yrs Ur 2009-11 MK2 's.
Most parts are interchangeable with Jazz however specific JDM Fit are built for home market.
If you find a car locally get the vin then use those details to cross ref spares available in UK.
Your main issue importing any Honda is mileage and service history issues. Never
think about buying without JVEC mileage
check as regards service then it's down to auction schedule and questions asked before starting the import process. Postage charges in past few years have risen from
overseas has killed the previous market. I know from attempts to import parts for my 34 yr old Subaru..overall take care but if you want a Fit go ahead after researching and checking with insurance quotes.