The thing about importing an aircraft and keeping it on the N register, the aircraft is 'owned' by a US trust company (unless you or someone you know is a US citizen). A foreigner (from US) cannot own an N reg aircraft as such. As the aircraft is now 'owned' by a US trust company, the CAA could not force you onto the G register, anymore than they can force the UA 777 that does the LAX - LHR run every day, onto the G register.
However, I think that it is a worthwhile reason to have a N reg plane, just so you can 'Bypass the CAA requirements'. (IR $4000 as opposed to £12000 for one reason, ratings added for free, no annual flight tests to keep ratings like the IR etc etc).
Cheers
EA
