Hi Nard,
Welcome to the forum. I have a 15 yr old step-son, a 21 month old toddler and one on the way. I know exactly what you mean by trying look after them and keep yourself sane. Your husband needs help, he deserves help and for all of you he must get it. What are the Veterans services like in the UK? Thankfully we didn't have the children in the environment when Anthony was doing the alcohol thing, I would have left for sure. My strategy for dealing with Anthony's apathy about treatment, at the stage that your husband is at was to throw a Veterans Counselling Service card on his desk, told him he had PTSD and if he didn't get treatment I was gone. Tough gamble, it paid off for me. If your husband acknowledges that he has PTSD, he's not in denial and that's a good step, he now needs a boot in the ass. He is substance abusing, taking his crap out in your general direction and I can almost bet that you are buffering the children from the worst of it and copping all the crap. His issue not yours!!!
The alternative is not really an option for you or your children Nards - you should not have to put up with years of him wallowing in his PTSD. If he knows he has a problem then the onus is on him to make his world better. As a consequence yours will be better too.
Sorry if I have been too blunt, you will notice that this is a theme of this forum. My husband doesn't do bs, in fact only those with PTSD in denial do bs and hence this forum isn't about bs. It makes me angry when those with PTSD are affecting their families and they know they have it, they just won't do anything about it. Drugs and alcohol, crap for him, you and your children. Alcohol really ticks me off because the damn thing is a depressant. How the hell can you fight depression when you are adding to the problem??
Don't let my rant put you off coming here. Please do, vent and ask for advice. We are here to support everyone affected by PTSD.