I'm sure there will be elements of truth in this once we get to the bottom of it.
I'm puzzled though by the choice of surname if he was using if this is as an alias.
Looking at the birth, marriage and death indexes, Markinson is almost unique to Leeds and Yorkshire uUntil the later parts of the 20th century) in its distribution. Of all the surnames, why chose this one?
I'll have another look through the newspapers and the later bigamy reports, the papers are transcribed using ocr software and they aren't always accurate.
This was my thoughts entirely. Surely if the bigamy tale is true and he was trying to bury his past, he would've gone for a more common surname?
There are a number of Markinson lines within the Jewish community, non to my knowledge related to my family.
If I need to spend time looking through somewhere for clues, please let me know as I'm not 100% sure where I need to be digging but don't mind. My thoughts and intentions at this point are to contact the prison archives and look through archives of Yorkshire Post editions, even for totally different names of bigamists at that time.