The reason I ask (I used to live in UK) is that you can get FREE Therapy there, the sessons, better meds for her (and you if you want to partake) can make a world of difference.
In my past experience - couples fight and have problems with only one of 2 things (or both ) SEX and MONEY - Fix one first, then the other one second, it will work if both are fixable, A real therapist - one who is a professional, can do the dirty work for you, if you have exhausted that options, then Plan "B" may be better, just make sure you tell your kids EVERY DAY - " I LOVE YOU" thats all they want to hear form their daddio.
Ciao and PM me anytime!
DG