Thank you for the information.
The way the criminal justice system works in the U.K., once you made your first statement of complaint that lead to your husbands arrest, you became a witness for the prosecution as well as the alleged victim of domestic violence.
Although you later made a second statement, retracting your first about the incident, the CPS can still proceed with a case against your husband and still use your first statement of complaint in court. They would also have to use the retraction, so the court would hear both.
As a witness for the prosecution, the CPS would issue you with a witness summons to attend court to give evidence.
On the day of trial, if you have failed to attend court, Then the prosecution would really have two options open to them. First they could ask for an adjournment of the case to a new date and at the same time, ask the court to issue a warrant for your arrest for failure to attend court on the witness summons. Or, they could at that point, decide that because you did not attend, and had in fact made a retraction statement, they could decide to offer no evidence and discontinue the case.
If the CPS asked for an adjournment, then the most likely step then oils be for your husbands lawyer to appose the adjournment asking the court to dismiss the case due to the fact that you, the key witness had failed to attend court, and also based on the fact that you had made the retraction statement.
The choice would then be up to the court.