Only read first and last pages.
This is nuts.
And what will your DH bank statements tell them? They're going to sit down and read through all of them? That won't tell them if you were actually working for any of it. I mean. What?
If you had been a single parent and living at your parents, would they want to see your parents bank statements?
What if you had split up from your OH and that's why you want to get back to work, where are you supposed to get this evidence from?
And what business is it of theirs how much he earns. Do they have an income threshold over which they'll believe you?
Women taking time out of work for children isn't exactly uncommon.
If a man took a 1 year sabattical and went traveling, what evidence would they ask for? His holiday pics? A restaurant receipt from each country? And how would they know he didn't work out there?
It's totally bananas. And totally out of order.
Also in the past I've found agencies like this to be useless. They are ok maybe when it's a person who is doing X job now, who wants to do X job somewhere else. Easy. They're not really interested in anything more involved.
In the past there have been things about these companies posting made up jobs to get people onto their books.
Applying directly is much better IMO.
Tell them to get stuffed OP.