I also wanted to post on here the things they kept:
1) My explaination about why our finances are so low at the moment (slow time at my husband's job, me being unemployed at the moment, and just coming back from holiday).
2) Letter from my inlaws stating that we live with them, and how much we contribute as rent, share of bills etc.
3) An email from a job agency stating that as soon as I got my ILR they'd let me register with them and do their best to find me a job (also stapled the woman's business card on to it).
Hope this helps anyone who finds themselves living with inlaws and/or unemployed while applying. I also did a proposed budget based on my previous salary - they didn't keep it but I'm sure it showed that I do normally contribute to supporting us.