I'm afraid you have to spell it out to these people. ..they aren't gonna check with no inland bloody revenue. .it's up to you to spell it all out. ..I've managed thus far to bring back 2 wives and a mother in law without problems. . Following the advice on this forum first before sending off application. ..for the financial section I gave a covering letter explaining my out goings and incoming. ..I then highlighted on bank statements. ..you have to explain as if you are explaining to a 5 yo...if you think like that you ain't gonna have a problem.
I got a specialist solicitor for mother in law visa. ..waste of money that was. ..you still got to provide the documents asked on the UKBA application as well as providing proof the woman's going back. ..the only difference being, it's a specialist solicitor asking the questions! !
I can't criticise you, had I had taken the time to read on here about culture and relationship just as I did about visas I wouldn't be in the mess I'm in now.

So, Good Luck my friend