name I am so so sorry to hear your latest news 
When I read your excerpt from your solicitor's letter I sat open-mouthed - it was almost word for word a letter which I received from my solicitor when I went through my separation and divorce. So much so that I nearly clambered into the loft to retrieve it. I wonder whether it is a 'standard' advice letter to those of us in just such a situation.
Anyway, here is my story. I will try to keep it short and I hope you find it useful and that it will give you strength and, more importantly, hope 
I, like you, decided I wanted out of my marriage (mine wasn't nearly as bad as yours but it was wrong and time to separate). My exH was beside himself, incredulous, disbelieving and 'shattered'. We cried, we screamed and he pleaded and begged. I gave him an ultimatum (details irrelevant) which he could not adhere to. I therefore informed him that this was the end, no more 'trying' and we agreed that he would look for somewhere else to live for the time and then look to sell the house and go our separate ways. I consulted a solicitor (against his wishes and this was the catalyst) who started the ball rolling. He was cross about this but still in agreement that he should move out. However, after speaking to a bunch of divorced wankers colleagues - he decided to change tack entirely and the abuse began. And worsened day on day. Threats to beat me, pinning me down and telling me he would rape me (it was his right, as my husband to 'take' me when he wished), threats to report me to Social Services for child abuse, drug taking (does paracetamol count?!) and alcoholism (again, a glass of bubbles at Xmas
) I emailed my solicitor informing them that his behaviour was escalating and outlining his threats.
That is when I received the 'word for word' letter that you did. I thought, that is it, I am powerless, I just need to dig deep and not wind him up. Or should I stop ALL of this? Should I throw in the towel and stay put? I resolved to KOKO with the separation. He ramped it up.
He assaulted me whilst I was drying our toddler after his bath.
With the help of family I escaped the house the next day (he'd locked us in the house but I'd hidden a spare key to the patio doors). I rang the solictor who immediately escalated my case to their senior family law partner. She called the police. He was arrested but claimed I had attacked him and our toddler DS was nowhere near the scene, the fucking lying bastard.
We went to court where the judge, although 'not of a mind' to grant me an occupation order (you gotta love judge-speak) strongly advised exH to leave the property until the divorce settlement was finalised. ie to do what we could have done from the beginning.
exH left but a couple of weeks later informed me, by getting right up into my face and pointing his fat finger at me (the twat) that when he got back from working abroad, he would move back into the house. He said he would do this on Xmas eve - 'ha, no fucking solicitors or judges will be there to help you. There is fuck all you can do about it and I WILL MAKE YOU FUCKING PAY FOR ALL OF THIS'
The day after he left to go abroad for work, I wrote an email to my solicitor outlining the above and to inform her that I would be leaving the marital home. I would not put my children's safety and my own in jeopardy any longer. If that put me in a weaker position in claiming the asset to which I was entitled then so be it - I would walk away from everything if necessary. I found a beautiful rented place for the children and I. exH came home to an empty house. I was free.
Sorry for the intense ramble but it actually feels kind of good to write it down (7 years after the event)
but here's the thing, it made not a jot, not a single ounce of difference to the divorce settlement that I wasn't in the marital home - NOT ONE FUCKING JOT
Ask your solicitor to tell you exactly why you and your children have to remain in a property in which you fear for your safety. I would inform her that it is her job to get you what you are legally entitled to and not to have you living in fear just to make her job a little easier.
Now? Here I am, 7 years down the line in MY house - a little 3 bed semi. My children and I could not be happier.
I wish this for you.
This will be you x