Haha, it is ok... I just noticed this has got back up the food chain. And yes, thanks for some very good information that helps not just us, but other forum users.
In our case, she had a finality, signed by the acting clerk, just confirming that the Judgment issued 1 month earlier has become final and executory in that there is no appeal or reconsideration. We also had a copy of the Marriage Certificate stating that the marriage is declared null and void, and a copy of the said court order signed by the Judge.
All of this is included in our application. As the ECO guidance states
"You should warn anyone going to the United Kingdom for marriage who has previously been married, or is aged 16 or 17, that he/she may be required to provide the registrar with evidence of freedom to marry before the Registrar can accept a notice of marriage. Where you have doubts about an applicant’s intention to marry/register a civil partnership, you should ask to see this evidence before issuing an entry clearance. The kind of evidence you will need to see is as follows:
* Widowed person: death certificate of the late spouse.
* Surviving civil partner: death certificate of the deceased civil partner.
* Divorced person: evidence of divorce, e.g. divorce certificate. (This must be a decree absolute not a decree nisi. This will be stated on the order from the Family Court - a person is legally divorced until the absolute is issued)."
Now, our finality didn't read decree absolute, nor decree nisi. I am completely dumb to some of the legalities, but I guess the above (in our case, and in the case of others in this situation) will be satisfactory.