I can't imagine a school would set an early test for a child so it would either be at the same time or later
some LEAs allow the child to take the test abroad in their own school, it really varies which LEAs - some expect people to turn up regardless, others make arrangement for Crown employees etc - you need to ask Lincolnshire.
I am not sure how passing in year 6 and wanting a place in year 8 will pan out - Most schools will want a more recent assessment of how they are getting on and would set another test for all those applying for a year 8 or later place.
Thanks - that helps. Sounds like I ask Lincolnshire LEA about the possibility of a test abroad (or later if we travel back at some point), and presume to do some occasional older Bond books etc to ensure a smooth year 8 or later test if needed.