You HAVE to send a copy of his passport photo page - that is the only document they will accept as proof of his identity and UK citizenship (unless he has no valid passport, in which case you send his birth certificate instead).
Ideally you should get it certified (about £8-10 at a Post Office), though some people have been okay just sending a regular photocopy.
sunshineusa - you did include at least a copy of his passport photo page, didn't you? Without it the visa can be refused, due to not having evidence of his UK citizenship.
You should NOT include any other documents about your husband - police checks, background checks, NI number etc. cannot be considered at all and will be ignored, as they are not considered suitable evidence of his nationality.
The only person who should send police records is YOU, the applicant, but only in the case that you have criminal convictions to declare.
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