There's an anomaly in your post which has left me rather confused. It arises because you indicate that the
police have laid down the bail conditions but a date has been set for a
Crown court hearing. That doesn't make sense to me. I'll try to explain why. (I'm not just being pedantic. It has a bearing upon your course of action).
When someone is arrested, and then bailed, they're (fairly obviously) on
police bail. It's the police who make the bail conditions and who can vary them.
However, as soon as a person appears before a court, it's the
court which makes any bail conditions and only that court (or a higher court) which can vary them. (So it's completely pointless appealing to the police to change the bail conditions, as they're no longer anything to do with the police).
A case can't reach the Crown court without passing through a magistrates' court first. If a date has been set for a
Crown court hearing, your husband must have already appeared before a magistrates' court. If so,his current bail conditions were set by the court and not by the police. (Those conditions might be identical to those which were originally imposed by the police but they're still laid down by the magistrates and not by the police).
So the first thing to do is to establish whether your husband's current bail conditions were set by the police (because he's not yet appeared before any court) or by a court (when he appeared before it). Then you'll know who to ask to try to get the conditions varied.
The police or court (as appropriate) might be more inclined to take note of your representations if you're backed up by a representative of an accredited agency, such as Victim Support. I therefore suggest that you get in touch with them:
http://www.victimsupport.org.uk/
Chris