Phoebe,
Please understand that others sometimes do not understand the 'in's and outs' of an abusive relationship. It's very easy for others to say 'just leave' and 'how can you put up with that'. Listen to their advice because the majority of people would not tolerate abuse, however you need to look very closely at your situation and decide what is best for you. The hands of the police are tied when it comes to domestic situations. They have to been seen to take positive action (in other words removing you husband from the situation - arresting him) The CPS then make the decision on whether he is charged, not the police as the have very little influence on this.
Anger management is not suitable for domestic abusers. There is a possibilty that your husband may be required to complete a domestic abuse course (depending on what is run in your area) by the court. If he does not recieve this as part of his conviction, you must seriously consider if he would be prepared to undertake this. Generally the courses are given to repeat offenders but he can apply for the course himself, but it will be voluntary an it will require a willingness to change. Enquire at you CAB, they will have details of the courses in your area.
If your husband has no previous convictions for violence (not just against you) it is unlikely he will recieve a custodial sentence. It is likely to be a suspended sentence or a community order.
You should be able to see him in Wormwood Scrubs.