Busy day, sorry to keep you all waiting
Firstly, yes I over reacted, and I was more angry at myself than the salesman, like I said in my OP I was an idiot not to check for myself. I was too excited to drive the beauty home than to dot my i's and cross my t's.
Called the showroom and they asssured me that the service book was there... went through the car again and found it in one of the boxes behind the seat all stamped up
bit embarrassed really although not really sure why it wasn't with the other paperwork, the MOT's etc were all with the manual.
Panic over, thanks for trying to calm me down guys.