what I do remember is the shameful manoeuvring by BALPA over the creation of the common seniority list in order to place everyone from the old BOAC list above my course
I find this very hard to believe. I have in front of me the entire BA/BCAL joint seniority list which was produced on 8th January 1988. If you PM me the DOJ of your course, I will see if any BOAC pilots went ahead of your course. The list is 39 pages long so I haven't checked it all, but from what I can see it was done on date of joining for the BEA/BOAC pilots.
EDIT;
Meikleor
From your other posts I assume that your course joined in 1971. I have checked the list for 1971 and the seniority was done strictly on date of joining. If you want to give me your email address (by PM) I can scan and send you the pages. It is sad if you've been labouring under a misapprehension for all these years.