Cant see the B747's ever leaving the UK to be registered elsewhere. I recall that when BA sold them to EAL at around $900K per aircraft there was a major (yes major) issue with aircraft and engine records and completeness thereof.
BA couldnt come up with a complete set of back to birth records. Any foreign register would take a pretty close look at this. Not even sure the aircraft would get an Export C of A.
Anyone else share this view?