You're first point of contact is Building control, if the job requires it, the BCO will issue copies to a fire officer who works for the fire brigade service but as already mentioned only if BCO considers it neccesary and in developments such as yours this is unlikely as you've found out. He (the BCO) can approve it but again as already mentioned you may not get very far, regularisation cannot be applied to the bits that suit you, you will likely have to get the lot regularised or none at all.