They finally signed the document today and returned it to me. Now the payment has been released to them.
It doesn't seem real that this is the end of a decade long struggle with unmanageable debts. Particularly because I'm in the worst point in my life professionally, which is what made the F&F viable in the first place. Really strange.
Thanks for all the great advice and this forum. I've been reading it far longer than the point when I finally registered. It's a truly brilliant resource, and it has helped me no end in getting to this point.