Apologies for delay completing this line of enquiry. I got sidetracked AND the pics weren't any use so I'm reshooting today.
Here anyway is the external packaging-

What is interesting, or is this just mispackaged, is the RR car inside.
At face value it is an A1G? I will attempt to photograph close up trucks and u/b detail. I also obtained a similar SP car without box, but appears to have different u/b (from memory).
regards
davew