Sorry I wasn't very specific in my original question. Here is a better outline of my situation (names not mentioned):
Mother's name on UK birth certificate: S... V... N... A...
Here S... is my mother's first name and A... is her surname
Mother's name mentioned as 'before marriage' name in her marriage certificate: S... R... R... A...
Here the R... and R... were her father's middle names (as per local customs in our part of India- the father's middle names are XXXXX XXXXX his daughter's first name)
There is no name mentioned as her "post marriage" name (because when my parents married in 1984, it was not required to record this detail).
In her Indian passport and my birth certificate, her name appears as:
S... D... V...
Here the D... is my father's middle name (once again, as per local customs attached to the wife's first name after marriage)
The V... is her new surname that she took on after her marriage to my father. This is also my surname.
I hope I didn't complicate matters further?
Thanks for your quick response- I'd be grateful if you can provide any further suggestions.