I think you need to discuss it all with your husband and clarify exactly what the situation is, then you can workout the way forward as theres so many options depending up on the exact circumstances.
+1
You need to clarify with your husband, where he gained the NCD that he is using on the zed? If it's fifteen years of not claiming on the company cars insurance, then he needs to clarify with the insurer of the zed that this is acceptable, as as far as I'm aware, it's not.
If he is using NCD that he had from his CBR, he also needs to clarify that this is acceptable as a) it's a motorbike and if this was a few years ago, how big a gap will the insurer allow in insurance policies to allow you to carry on the NCD. As I said previously, you can't build up a load of NCD and then not have a policy for a few years and then just start up a policy using the previous NCD. NCD is given for CONSECUTIVE years of not claiming, any break in insurance, renders the previous NCD invalid usually.