Cause I tend to ramble:
Don't include the other bank accountant statements that don't specifically show your salary deposits. It really just confuses things. They really don't care if you live within your means or how you pay you bills/mortgage. All they care about is that you are earning that 18.6k GBP and you can prove it.
So yes, it is strictly about proving your salary.
Just cause other people may read this, do not redact the bank statement in any way. The bank statements must be printed by your bank branch or be the posted/mailed copies. If you print them off at home they would need to be taken to your branch and stamped/signed by bank staff on every single page.
If they decide that they want to see your husbands bank statements and pay slips they may send you a letter or email requesting them. I can't remember which they do for FLR as I wasn't requested for more info.
This was my topic back when I did it in 2014. It's slightly different now but notice my list is ridiculously short compared to fiance visa.
http://talk.uk-yankee.com/index.php?topic=83285.msg1105420#msg1105420Pretty sure this list hasn't changed... I looked at a few of the recent topics in the Visa section and it seems to still be the same.
Because it was my first FLR I didn't have to do the 2 years of correspondence. You MUST do this.
You need to have a minimum of 6 pieces of mail (if addressed jointly) from a minimum of 3 different sources. These must be originals. They want them more or less evenly spread over the 2 years.
If they aren't joint pieces of mail you must have one piece of mail with each of your names on it every 4 months. So minimum of 6 pieces, maximum of 12.(I'd seen you mention this elsewhere, but again, just in case anyone else read this)
*EDIT* they tell you this information right in your application form.