SAS/SBS info

[Draconis]

Hey chaps. I'm keenly interested in the SAS and SBS over there. I know more about the SAS but have read a very brief synopsis about the SBS in relation to the SAS and how they differ. Despite that, I'm still a bit confused on where to go for good information. I went to ebay.co.uk and found lots of books about the SAS. I keep running into a popular author by the name of Barry Davies. Any info you can give me? Cheers.