Thanks for that response Newforest. I’m aware of what happened where after 1972 and her current status, it’s that bit after the film that is vague and so far unrecorded.
By the way the codes were actually “6J+PR”, that’s what she was wearing when she left Bovingdon and after arrival and repainting at Southend. They did of course wear a multitude of code combinations during filming though.