Your husband's actions qualify as assault.
You have a choice as to whether you make a witness statement.
if you do make a statement, your husband will be interviewed under caution, at a police station, probably under arrest, to get his account.
The police will refer the case to the Crown Prosecution Service, who will decide whether to charge him.
Your husband might plead guilty and be sentenced without a trial. If he pleads not guilty, there will be a trial in a Magistrates' Court and you will be called to give evidence. It is possible that you will be compelled to give evidence, even if by the time the trial takes place you do not feel that you want to.
A trial would not take place for some time, possibly many months. In the meantime you can start divorce proceedings if that is what you want. You do not have to wait until the criminal proceedings are concluded.
If you do not think you are safe with your husband, you can apply to the Family Court for a non-molestation order. The order could include a prohibition on his contacting you or coming to the house.
Only you can make a decision about whether the marriage is salvageable, but your husband's complete denial that he has done anything wrong is a bad sign.