Remember that you will get 50 per cent of everything, so £160k equity means £90k for you - that's a damn good deposit in many areas of the country.
Or - if you can do this amicably, your H might decide to pay the mortgage on the house (or an interest-only from this point in) for you and your son until he finishes school and then sell.
My husband did, because I made no other claim on him. Financially, looking at it objectively, I lost massively (I made no claim on his pension, savings, investments etc). But I kept my son's home, and my ex (we did the interest-only) made loads of money in the end (house price increases) so he was happy to do it.
So there are options for you financially.
I wouldn't go to a solicitor as the first step though, unless your H is abusive. Speak to him. Go to counselling together. Even if it doesn't save the marriage (it probably won't because you are almost out the door, as was I), it will help both of you. It will help you to clarify why this has to end, and it will help him to get to where you are, at least in part - they often will counsel individual partners when it becomes apparAnd please donent that one really is done.
And please don't worry about your son - he is still so young, and the age my son was when we divorced. He has often said how he cannot imagine me and his dad together, and how much he loves having 2 homes and a step-brother and step-mum that he would never have known if we had stayed together. My ex is much happier, and so am I (I am single).
Oh, and my son has just said don't forget your son will get 2 Christmasses and 2 birthdays. He's now 20 - he's often said he feels sorry for children who only get one Christmas and Birthday!
I also promise you that the times on your own, without your son, will eentually become times you treasure. I also do woner if we would have had such a strong bond if I had stayed with son's dad. I know he would not have had such a strong bond with his dad.
My ex became a great dad when we split up - I don't know that he would have been so hands-on uf he hadn't had to be.
I'm trying to think of a downside, but I can't. (Except for me then getting into an abusive relationship - but hey, shit happens and shit makes you good at cleaning up shit to a better shine than before)