Funny how mothers of daughters don't seem to have these issues with their son-in-law. (None that I know anyway!) All women I know who have daughters, get on really well with their son-in-laws - including me. (I have 2 adult daughters, and me and my 2 son-in-laws think the world of each other.)
IME it's pretty much always 'mothers of sons' who have issues with the daughter-in-law. And of course, it's almost always women who have problems with their mother-in-law (their husband's mother.)
Most women I know who are married, don't get on with their mother-in-law. The have tried to get on with them, but the mother-in-law is cold and aloof and doesn't want a relationship with her. (in most cases.) Yet most of the men I know do get on with their mother-in-law. What is all that about? 
Do these mothers who have sons feel threatened by their son's wife? Do they fear they won't see the grandchildren? Do they fear the son's wife's mother will take priority?
Are they trying to make their mark and show that they are as important as the son's wife's - and her mother? (Or more!) It's a well-documented fact that maternal grandparents are usually closer to the grandchildren, that the paternal ones. So are these mothers of sons threatened and jealous?
Oddly my husband gets on brilliantly with both our son-in-laws, and doesn't feel remotely threatened by them or think they're going to take his precious daughters away! Yet many mothers of sons act like they're threatened by their daughter-in-law (and her mother.) 
Never had any sons, so I don't know why some mothers of sons are like this. As I said, I reckon they're threatened by the son's wife (and her mother.) The mothers of both my daughters husbands are a bit like this. Not as bad as some, but quite hard work and needy. They are both are OK with my daughters, but they tolerate them rather than like them or embrace them. They definitely see them as a threat.
Their husbands always take their wife's side though, which their mothers don't like. This is what your husband should be doing @Kirstymwh Tell him grow a pair, and stand up to his overbearing and controlling mother! Most women I know have mother-in-laws who aren't keen on them, or just tolerate them, and yeah I am pretty sure they're threatened by them. Yeah sure, some mothers of sons are not like this with their daughter-in-laws, but many are.
I always got on OK-ish with my mother-in-law, but not when me and DH first met. She tried to put her mark down and let me know she was the boss, but my DH put her in her place pretty sharpish, and let her know I was his priority now.