I guess you are talking about a Kitfox 7 which is a totally different beast to other and past Kitfox aircraft.There are only a couple currently on the UK register.
If you intend to have one on the 'G' reg the Kitfox 7 is already LAA approved as a homebuilt Permit aircraft in the UK at a MAUW of 635kg (1400lbs) and not 1550lbs as it is in the USA.
If you did intend to import a USA built Kitfox 7 and get on the G reg you would have to negotiate and prove to the LAA that the build had been done in compliance with UK LAA building standards and practices.
Probably easier and cheaper to buy a kit and build one from scratch!