Bus driver’s license, yes or no?

Hello municipality, I have a small problem. I want to buy a bus for private purposes, but now I have a problem with the driving licence class, where no authority can really give me a clear information. I have acquired the class CE this year (with some others who got the 179 with registered) in order to get away halfway cost-effectively I wanted to get a bus with at least 30 years, problem is that get with an H-character of the original condition b (What would all seats have to remain in it, according to the driving licence right there is the possibility at CE “…up to 8 seats outside the driver’s seat…). Do I need for a 30 year old bus that should be registered as a classic car the driving licence class D or D1?? Vehicle should only be used privately, maybe I also wanted to take my wife and the dog with me.