Warning, this subject is old (3973 days without answer)
antp
Attachment does not seem to be there.
I removed the "Series I" from the [MO].
Anyway the first ones are labelled [MO] unlike the next ones, I guess it is enough to differentiate them.
johnfromstaffs
Scan attached of the Morris Oxford Series MO Operation Manual front page showing that, even in BMC days the cars were never called Series I.
Why perpetuate an error?