In reply to Brev:
> It seems to me that the website you linked to is if you want to become a French national as an ascendant (parent/grandparent) of a French citizen rather than as a descendant (so the opposite from your situation).
> It might just be easiest to give your nearest French embassy/consulate a call and ask how the process works?
Thanks Moondancer, that's what it looked like to me too, but then I couldn't for the life of me find a page that dealt with having a parent who was a French national.
Will definitely call the embassy/consulate at some stage, but was hoping to be a little forewarned first.