i think documents like example if widow, death certificate of departed husband,plus the marraige certificate of that husband, any documents if been annuled,
i think it is best that your wife phones them to check,to be sure, they will check before the seminar, if she has all required documents, if not another appointment may be needed,or possible they might let her email a copy,if its just the odd document, take photo copies also of documents, expect at least 3 hours inside,

thats the best i am able to tell you, good luck
Hello Imagine
Thank you for this I will ask my wife to do just that
Regards
LG