I am relieved to know that you got through to WA and that they came through for you!
It seems probable that he was held in custody overnight to appear before the Magistrates this morning and, if this is the case, he will have had access to a duty solicitor.
The court can only impose a restraining order today if he pleads guilty. If he enters a not guilty plea he will most probably be released on bail and it's to be hoped that conditions will be imposed prohibiting him from making contact with you in any way and requiring him to live elsewhere pending a full hearing of the case.
However, if he is subject to conditional bail it will be time limited and he will have the right to dispute or challenge any restraining order that may be imposed by the court.
The police may refer your case to a MARAC (further information here: www.reducingtherisk.org.uk/cms/content/marac ) and may inform SS as your dc were in the home when the incident took place.
Please don't be alamed as your parenting is not under question and all/any agencies involved will be looking to safeguard you and your dc.
You should be allocated a dv worker who will guide you through the various processes that have been set in motion and arrange for you to meet with a solicitor who has specific expertise in domestic abuse matters.
In view of the fact that he is named on the mortgage and deeds of the property you currently live in, I would advise you to apply for ex parte non-molestation and occupation orders as soon as possible. There are no court fees to pay when making application for these orders but, if funds are tight, the police report of the incident may entitle you to apply for legal aid for a solicitor to represent you at the hearings if you are not sufficiently confident to represent yourself.
I'm sorry to say that at time when may you want to hunker down with your dc and let their excitement at Santa's forthcoming visit lift your spirits there will be demands on your time that you hadn't reckoned on, but please rest assured that any time spent now on ensuring your safety will be time well spent as it will ensure that you and yours enjoy a happy Christmas.